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<!-- Module User's Guide -->

<chapter>

	<title>&adminguide;</title>

	<section>
	<title>Overview</title>
	<para>
		The module implements text based operations over the SIP message
		processed by &kamailio;. SIP is a text based protocol and the module
		provides a large set of very useful functions to manipulate the
		message at text level, e.g., regular expression search, replace
		or substitutions, checks for method type, header presence,
		insert of new header and date, string comparisons, multi-part body
		operations, etc.
	</para>
	<para>
		If not stated otherwise, the regular expressions parameters for search,
		replace or substitute have to be in POSIX format. For PCRE regular
		expression matching, see the pcre or dialplan modules.
	</para>
	</section>
	<section>
	<title>Known Limitations</title>
	<para>
		Search functions are applied to the original request,
		i.e., they ignore all changes resulting from message
		processing in &kamailio; script.
	</para>
	<para>
		Search ignores folded lines. For example,
		search(<quote>(From|f):.*@foo.bar</quote>)
		doesn't match the following From header field:
<programlisting format="linespecific">
From: medabeda
 &lt;sip:medameda@foo.bar&gt;;tag=1234
</programlisting>
	</para>
	</section>

	<section>
	<title>Dependencies</title>
	<section>
		<title>&kamailio; Modules</title>
		<para>
		The following modules must be loaded before this module:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>No dependencies on other &kamailio; modules</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	<section>
		<title>External Libraries or Applications</title>
		<para>
		The following libraries or applications must be installed before
		running &kamailio; with this module loaded:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>None</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	</section>


	<section>
	<title>Functions</title>
	<section id="textops.f.search">
		<title>
		<function moreinfo="none">search(re)</function>
		</title>
		<para>
		Searches for the re in the message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		</itemizedlist>
		<para>
			Note: it performs Posix regex matching and the 're' parameter
			is compiled with the flags REG_EXTENDED|REG_ICASE|REG_NEWLINE.
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>search</function> usage</title>
		<programlisting format="linespecific">
...
if ( search("[Ss][Ii][Pp]") ) { /*....*/ };
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.search_body">
		<title>
		<function moreinfo="none">search_body(re)</function>
		</title>
		<para>
		Searches for the re in the body of the message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>search_body</function> usage</title>
		<programlisting format="linespecific">
...
if ( search_body("[Ss][Ii][Pp]") ) { /*....*/ };
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.search_str">
		<title>
		<function moreinfo="none">search_str(text, re)</function>
		</title>
		<para>
		Searches for the re in the body of the message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>text</emphasis> - text to perform regex searching
			over it.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>re</emphasis> - regular expression to match over
			the 'text' parameter.
			</para>
		</listitem>
		</itemizedlist>
		<para>
			Both parameters can contain variables.
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>search_str</function> usage</title>
		<programlisting format="linespecific">
...
if ( search_str("$ru", ";transport=tcp") ) { /*....*/ };
...
</programlisting>
		</example>
	</section>

		<section id="textops.f.search_hf">
		<title>
		<function moreinfo="none">search_hf(hf, re, flags)</function>
		</title>
		<para>
		Searches for the re in the body of a header field.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hf</emphasis> - header field name.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>re</emphasis> - regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>flags</emphasis> - control flags - it
				has to be one of: a - all headers matching the
				name; f - only first header matching the name;
				l - only the last header matching the name.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>search_hf</function> usage</title>
		<programlisting format="linespecific">
...
if ( search_hf("From", ":test@", "a") ) { /*....*/ };
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.search_append">
		<title>
		<function moreinfo="none">search_append(re, txt)</function>
		</title>
		<para>
		Searches for the first match of re and appends txt after it.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String to be appended.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>search_append</function> usage</title>
		<programlisting format="linespecific">
...
search_append("[Oo]pen[Ss]er", " SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.search_append_body">
		<title>
		<function moreinfo="none">search_append_body(re, txt)</function>
		</title>
		<para>
		Searches for the first match of re in the body of the message
		and appends txt after it.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String to be appended.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>search_append_body</function> usage</title>
		<programlisting format="linespecific">
...
search_append_body("[Oo]pen[Ss]er", " SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace">
		<title>
		<function moreinfo="none">replace(re, txt)</function>
		</title>
		<para>
		Replaces the first occurrence of re with txt.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>replace</function> usage</title>
		<programlisting format="linespecific">
...
replace("server", "&kamailio; SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_body">
		<title>
		<function moreinfo="none">replace_body(re, txt)</function>
		</title>
		<para>
		Replaces the first occurrence of re in the body of the message
		with txt.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>replace_body</function> usage</title>
		<programlisting format="linespecific">
...
replace_body("server", "&kamailio; SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_hdrs">
		<title>
		<function moreinfo="none">replace_hdrs(re, txt)</function>
		</title>
		<para>
		Replaces the first occurrence of re in the SIP headers of the message
		with txt.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>replace_hdrs</function> usage</title>
		<programlisting format="linespecific">
...
replace_hdrs("&kamailio;", "&kamailio; SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_all">
		<title>
		<function moreinfo="none">replace_all(re, txt)</function>
		</title>
		<para>
		Replaces all occurrence of re with txt.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>replace_all</function> usage</title>
		<programlisting format="linespecific">
...
replace_all("server", "&kamailio; SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_body_all">
		<title>
		<function moreinfo="none">replace_body_all(re, txt)</function>
		</title>
		<para>
		Replaces all occurrence of re in the body of the message
		with txt. Matching is done on a per-line basis.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>replace_body_all</function> usage</title>
		<programlisting format="linespecific">
...
replace_body_all("server", "&kamailio; SIP Proxy");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_body_atonce">
		<title>
		<function moreinfo="none">replace_body_atonce(re, txt)</function>
		</title>
		<para>
		Replaces all occurrence of re in the body of the message
		with txt. Matching is done over the whole body.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - Regular expression.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>txt</emphasis> - String.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>replace_body_atonce</function> usage</title>
		<programlisting format="linespecific">
...
# strip the whole body from the message:
if(has_body() &amp;&amp; replace_body_atonce("^.+$", ""))
        remove_hf("Content-Type");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_str">
		<title>
		<function moreinfo="none">replace_str(match, repl, mode)</function>
		</title>
		<para>
		Replaces the first or all occurrence of 'match' with 'repl' by doing
		string comparison for matching. It is applied over headers and message
		body (not over the first line).
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>match</emphasis> - string to be matched.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>repl</emphasis> - string to be used as replacement.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>mode</emphasis> - 'f' - replace only first match;
				'a' - replace all matches.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>replace_str</function> usage</title>
		<programlisting format="linespecific">
...
replace_str("&kamailio;", "&kamailio; SIP Proxy", "a");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_body_str">
		<title>
		<function moreinfo="none">replace_body_str(match, repl, mode)</function>
		</title>
		<para>
		Replaces the first or all occurrence of 'match' with 'repl' by doing
		string comparison for matching. It is applied over the message body.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>match</emphasis> - string to be matched.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>repl</emphasis> - string to be used as replacement.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>mode</emphasis> - 'f' - replace only first match;
				'a' - replace all matches.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>replace_body_str</function> usage</title>
		<programlisting format="linespecific">
...
replace_body_str("&kamailio;", "&kamailio; SIP Proxy", "a");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.replace_hdrs_str">
		<title>
		<function moreinfo="none">replace_hdrs_str(match, repl, mode)</function>
		</title>
		<para>
		Replaces the first or all occurrence of 'match' with 'repl' by doing
		string comparison for matching. It is applied over the part with headers
		of the SIP message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>match</emphasis> - string to be matched.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>repl</emphasis> - string to be used as replacement.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>mode</emphasis> - 'f' - replace only first match;
				'a' - replace all matches.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>replace_hdrs_str</function> usage</title>
		<programlisting format="linespecific">
...
replace_hdrs_str("&kamailio;", "&kamailio; SIP Proxy", "a");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst">
		<title>
		<function moreinfo="none">subst('/re/repl/flags')</function>
		</title>
		<para>
		Replaces re with repl.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>'/re/repl/flags'</emphasis> - sed like regular
				expression. flags can be a combination of i (case insensitive),
				g (global) or s (match newline don't treat it as end of line).
			</para>
			<para>
			're' - is regular expression
			</para>
			<para>
			'repl' - is replacement string - may contain pseudo-variables
			</para>
			<para>
			'flags' - substitution flags (i - ignore case, g - global)
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>subst</function> usage</title>
		<programlisting format="linespecific">
...
# replace the uri in to: with the message uri (just an example)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1\u\2/ig') ) {};

# replace the uri in to: with the value of avp sip_address (just an example)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1$avp(sip_address)\2/ig') ) {};

...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst_uri">
		<title>
		<function moreinfo="none">subst_uri('/re/repl/flags')</function>
		</title>
		<para>
		Runs the re substitution on the message uri (like subst but works
		 only on the uri)
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>'/re/repl/flags'</emphasis> - sed like regular
				expression. flags can be a combination of i (case insensitive),
				g (global) or s (match newline don't treat it as end of line).
			</para>
			<para>
			're' - is regular expression
			</para>
			<para>
			'repl' - is replacement string - may contain pseudo-variables
			</para>
			<para>
			'flags' - substitution flags (i - ignore case, g - global)
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>subst_uri</function> usage</title>
		<programlisting format="linespecific">
...
# adds 3463 prefix to numeric uris, and save the original uri (\0 match)
# as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:3463\1@\2;orig_uri=\0/i')){$

# adds the avp 'uri_prefix' as prefix to numeric uris, and save the original
# uri (\0 match) as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:$avp(uri_prefix)\1@\2;orig_uri=\0/i')){$

...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst_user">
		<title>
		<function moreinfo="none">subst_user('/re/repl/flags')</function>
		</title>
		<para>
		Runs the re substitution on the message uri (like subst_uri but works
		 only on the user portion of the uri)
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>'/re/repl/flags'</emphasis> - sed like regular
				expression. flags can be a combination of i (case insensitive),
				g (global) or s (match newline don't treat it as end of line).
			</para>
			<para>
			're' - is regular expression
			</para>
			<para>
			'repl' - is replacement string - may contain pseudo-variables
			</para>
			<para>
			'flags' - substitution flags (i - ignore case, g - global)
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>subst</function> usage</title>
		<programlisting format="linespecific">
...
# adds 3463 prefix to uris ending with 3642 (just an example)
if (subst_user('/3642$/36423463/')){$

...
# adds avp 'user_prefix' as prefix to username in r-uri ending with 3642
if (subst_user('/(.*)3642$/$avp(user_prefix)\13642/')){$

...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst_body">
		<title>
		<function moreinfo="none">subst_body('/re/repl/flags')</function>
		</title>
		<para>
		Replaces re with repl in the body of the message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>'/re/repl/flags'</emphasis> - sed like regular
				expression. flags can be a combination of i (case insensitive),
				g (global) or s (match newline don't treat it as end of line).
			</para>
			<para>
			're' - is regular expression
			</para>
			<para>
			'repl' - is replacement string - may contain pseudo-variables
			</para>
			<para>
			'flags' - substitution flags (i - ignore case, g - global)
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>subst_body</function> usage</title>
		<programlisting format="linespecific">
...
if ( subst_body('/^o=(.*) /o=$fU /') ) {};

...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst_hf">
		<title>
		<function moreinfo="none">subst_hf(hf, subexp, flags)</function>
		</title>
		<para>
		Substitutions in the body of a header field.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hf</emphasis> - header field name.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>subexp</emphasis> - substitution expression
				in the same format as of the 'subst' function parameter.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>flags</emphasis> - control flags - it
				has to be one of: a - all headers matching the
				name; f - only first header matching the name;
				l - only the last header matching the name.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>subst_hf</function> usage</title>
		<programlisting format="linespecific">
...
if ( subst_hf("From", "/:test@/:best@/", "a") ) { /*....*/ };
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.subst_v">
		<title>
		<function moreinfo="none">subst_v(itext, subexp, ovp)</function>
		</title>
		<para>
		Sed-like substitution subexp applied to itext, with result stored in opv.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>itext</emphasis> - input text, it can contain variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>subexp</emphasis> - substitution expression
			in the same format as of the 'subst' function parameter, it can
			contain variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>opv</emphasis> - variable name where to store the
			result.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>subst_v</function> usage</title>
		<programlisting format="linespecific">
...
subst_v("$var(x)", "/:test@/:best@/", "$var(r)");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.set_body">
		<title>
		<function moreinfo="none">set_body(txt, content_type)</function>
		</title>
		<para>
		Set body to a SIP message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - text for the body, can include
				pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header,
				can include pseudo-variables.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>set_body</function> usage</title>
		<programlisting format="linespecific">
...
set_body("test", "text/plain");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.set_reply_body">
		<title>
		<function moreinfo="none">set_reply_body(txt, content_type)</function>
		</title>
		<para>
		Set body to a SIP reply to be generated by &kamailio;.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - text for the body, can include
				pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header,
				can include pseudo-variables.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>set_reply_body</function> usage</title>
		<programlisting format="linespecific">
...
set_reply_body("test", "text/plain");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.filter_body">
		<title>
		<function moreinfo="none">filter_body(content_type)</function>
		</title>
		<para>
		Filters multipart/mixed body by leaving out all other body
		parts except the first body part of given type.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>content_type</emphasis> -
				Content type to be left in the body.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>filter_body</function> usage</title>
		<programlisting format="linespecific">
...
if (has_body("multipart/mixed")) {
    if (filter_body("application/sdp")) {
        remove_hf("Content-Type");
        append_hf("Content-Type: application/sdp\r\n");
    } else {
        xlog("Body part application/sdp not found\n");
    }
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_to_reply">
		<title>
		<function moreinfo="none">append_to_reply(txt)</function>
		</title>
		<para>
		Append txt as header to the reply that is going to be generated by
		&kamailio; (e.g., via sl_send_reply(...)).
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - String which may contains
			pseudo-variables. Note that the value has to be ended with "\r\n"
			(end of header characters sequence).
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
		FAILURE_ROUTE, ERROR_ROUTE.
		</para>
		<example>
		<title><function>append_to_reply</function> usage</title>
		<programlisting format="linespecific">
...
append_to_reply("Foo: bar\r\n");
append_to_reply("Foo: $rm at $Ts\r\n");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_hf">
		<title>
		<function moreinfo="none">append_hf(txt[, hdr])</function>
		</title>
		<para>
		Appends 'txt' as header at the end of all the headers, or after
		last header named 'hdr' if the second parameter is provided.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - Header field to be appended. The
			value can contain pseudo-variables which will be replaced at run
			time. Note that the value has to be ended with "\r\n" (end of header
			characters sequence).
			</para>
		</listitem>
		<listitem>
			<para><emphasis>hdr</emphasis> - Header name after which the 'txt'
			is appended.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>append_hf</function> usage</title>
		<programlisting format="linespecific">
...
append_hf("P-hint: VOICEMAIL\r\n");
append_hf("From-username: $fU\r\n", "Call-ID");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.insert_hf">
		<title>
		<function moreinfo="none">insert_hf(txt[, hdr])</function>
		</title>
		<para>
		Inserts 'txt' as header before the first header field, or before
		first header named 'hdr' if the second parameter is provided.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - Header field to be inserted. The
			value can contain pseudo-variables which will be replaced at run
			time. Note that the value has to be ended with "\r\n" (end of header
			characters sequence).
			</para>
		</listitem>
		<listitem>
			<para><emphasis>hdr</emphasis> - Header name before which the 'txt'
			is inserted.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>insert_hf</function> usage</title>
		<programlisting format="linespecific">
...
insert_hf("P-hint: VOICEMAIL\r\n");
insert_hf("To-username: $tU\r\n");
insert_hf("P-hint: VOICEMAIL\r\n", "Call-ID");
insert_hf("To-username: $tU\r\n", "Call-ID");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_urihf">
		<title>
		<function moreinfo="none">append_urihf(prefix, suffix)</function>
		</title>
		<para>
		Append header field name with original <acronym>Request-URI</acronym>
		in middle.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>prefix</emphasis> - string (usually at least
			header field name).
			</para>
		</listitem>
		<listitem>
			<para><emphasis>suffix</emphasis> - string (usually at least
			line terminator).
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
		BRANCH_ROUTE.
		</para>
		<example>
		<title><function>append_urihf</function> usage</title>
		<programlisting format="linespecific">
...
append_urihf("CC-Diversion: ", "\r\n");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_present_hf">
		<title>
		<function moreinfo="none">is_present_hf(hf_name)</function>
		</title>
		<para>
		Return true if a header field is present in message.
		</para>
		<note>
		<para>
			The function is also able to distinguish the compact names. For
			example <quote>From</quote> will match with <quote>f</quote>.
		</para>
		</note>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hf_name</emphasis> - Header field name (long or
			compact form). It can be only a static string value.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>is_present_hf</function> usage</title>
		<programlisting format="linespecific">
...
if (is_present_hf("From")) xlog("From HF Present");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_present_hf_pv">
		<title>
		<function moreinfo="none">is_present_hf_pv(hf_name)</function>
		</title>
		<para>
		Same as is_present_hf() function, but the parameter can contain
		variables.
		</para>
		<example>
		<title><function>is_present_hf_pv</function> usage</title>
		<programlisting format="linespecific">
...
if (is_present_hf_pv("$var(hname)")) xinfo("Header $var(hname) is present\n");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_present_hf_re">
		<title>
		<function moreinfo="none">is_present_hf_re(hf_name_re)</function>
		</title>
		<para>
		Return true if a header field whose name matches regular expression
		'hf_name_re' is present in message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hf_name_re</emphasis> - Regular expression to
				match header field name. It can be only a static string value.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>is_present_hf_re</function> usage</title>
		<programlisting format="linespecific">
...
if (is_present_hf_re("^P-"))
    xlog("There are headers starting with P-\n");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_present_hf_re_pv">
		<title>
		<function moreinfo="none">is_present_hf_re_pv(hf_name_re)</function>
		</title>
		<para>
		Same as is_present_hf_re() function, but the parameter can contain
		variables.
		</para>
		<example>
		<title><function>is_present_hf_re_pv</function> usage</title>
		<programlisting format="linespecific">
...
if (is_present_hf_re_pv_("^$var(prefix)"))
    xlog("There are headers starting with $var(prefix)\n");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_time">
		<title>
		<function moreinfo="none">append_time()</function>
		</title>
		<para>
		Adds a time header to the reply of the request. You must use it
		before functions that are likely to send a reply, e.g., save()
		from 'registrar' module. Header format is:
		<quote>Date: %a, %d %b %Y %H:%M:%S GMT</quote>, with the legend:
		<itemizedlist>
		<listitem>
			<para><emphasis>%a</emphasis> abbreviated week of day name (locale)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%d</emphasis> day of month as decimal number
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%b</emphasis> abbreviated month name (locale)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%Y</emphasis> year with century
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%H</emphasis> hour
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%M</emphasis> minutes
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%S</emphasis> seconds
			</para>
		</listitem>
		</itemizedlist>
		</para>
		<para>
		Return true if a header was successfully appended.
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
		BRANCH_ROUTE.
		</para>
		<example>
		<title><function>append_time</function> usage</title>
		<programlisting format="linespecific">
...
append_time();
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_time_to_request">
		<title>
		<function moreinfo="none">append_time_to_request()</function>
		</title>
		<para>
		Adds a time header to the request. Header format is:
		<quote>Date: %a, %d %b %Y %H:%M:%S GMT</quote>, with the legend:
		<itemizedlist>
		<listitem>
			<para><emphasis>%a</emphasis> abbreviated week of day name (locale)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%d</emphasis> day of month as decimal number
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%b</emphasis> abbreviated month name (locale)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%Y</emphasis> year with century
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%H</emphasis> hour
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%M</emphasis> minutes
			</para>
		</listitem>
		<listitem>
			<para><emphasis>%S</emphasis> seconds
			</para>
		</listitem>
		</itemizedlist>
		</para>
		<para>
		Return true if a header was successfully appended.
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<example>
		<title><function>append_time_to_request</function> usage</title>
		<programlisting format="linespecific">
...
if(!is_present_hf("Date"))
    append_time_to_request();
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_method">
		<title>
		<function moreinfo="none">is_method(name)</function>
		</title>
		<para>
		Check if the method of the message matches the name. If name is a
		known method (invite, cancel, ack, bye, options, info, update, register,
		message, subscribe, notify, refer, prack), the function performs method
		ID testing (integer comparison) instead of ignore case string
		comparison.
		</para>
		<para>
		The 'name' can be a list of methods in the form of
		'method1|method2|...'. In this case, the function returns true if the
		SIP message's method is one from the list. IMPORTANT NOTE: in the list
		must be only methods defined in &kamailio; with ID (invite, cancel, ack,
		bye, options, info, update, register, message, subscribe, notify,
		refer, prack, publish; for more see:
		<ulink url="http://www.iana.org/assignments/sip-parameters">
			http://www.iana.org/assignments/sip-parameters</ulink>).
		</para>
		<para>
		If used for replies, the function tests the value of method field from
		CSeq header.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>name</emphasis> - SIP method name
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE, and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>is_method</function> usage</title>
		<programlisting format="linespecific">
...
if(is_method("INVITE"))
{
    # process INVITEs here
}
if(is_method("OPTION|UPDATE"))
{
    # process OPTIONs and UPDATEs here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf">
		<title>
		<function moreinfo="none">remove_hf(hname)</function>
		</title>
		<para>
		Remove from message all headers with name <quote>hname</quote>.
		Header matching is case-insensitive. Matches and removes also
		the compact header forms.
		</para>
		<para>
		Returns true if at least one header is found and removed.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hname</emphasis> - header name to be removed.
			It can be only a static string (because of the optimizations
			done at startup to speed up execution at runtime).</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>remove_hf</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf("User-Agent"))
{
    # User Agent header removed
}
# compact form: remove "Contact" or "m" header
remove_hf("Contact");
# compact form: remove "Contact" or "m" header
remove_hf("m");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_pv">
		<title>
		<function moreinfo="none">remove_hf_pv(hname)</function>
		</title>
		<para>
		Same as remove_hf() function, but the parameter can contain variables.
		</para>
		<example>
		<title><function>remove_hf_pv</function> usage</title>
		<programlisting format="linespecific">
...
remove_hf_pv("$var(hname)");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_re">
		<title>
		<function moreinfo="none">remove_hf_re(re)</function>
		</title>
		<para>
			Remove from message all headers with name matching regular
			expression <quote>re</quote>
		</para>
		<para>
		Returns true if at least one header is found and removed.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>re</emphasis> - regular expression to match
				the header name to be removed.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>remove_hf_re</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf_re("^P-"))
{
    # All headers starting with "P-" removed
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_re_pv">
		<title>
		<function moreinfo="none">remove_hf_re_pv(re)</function>
		</title>
		<para>
		Same as remove_hf_re() function, but the parameter can contain variables.
		</para>
		<example>
		<title><function>remove_hf_re_pv</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf_re_pv("^$var(prefix)"))
{
    # All headers starting with $var(prefix) value removed
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_exp">
		<title>
		<function moreinfo="none">remove_hf_exp(expmatch, expskip)</function>
		</title>
		<para>
			Remove from message all headers with name matching regular
			expression <quote>expmatch</quote>, but not matching regular
			expression <quote>expskip</quote>.
		</para>
		<para>
		Returns true if at least one header is found and removed.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>expmatch</emphasis> - regular expression to match
				the header name to be removed.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>expskip</emphasis> - regular expression to match
				the header name to be skipped from removal.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>remove_hf_exp</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf_exp("^P-", "^P-Keep-"))
{
    # All headers starting with "P-" removed,
    # except the ones starting with "P-Keep-"
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_exp_pv">
		<title>
		<function moreinfo="none">remove_hf_exp_pv(expmatch, expskip)</function>
		</title>
		<para>
		Same as remove_hf_exp() function, but the parameters can contain variables.
		</para>
		<example>
		<title><function>remove_hf_exp_pv</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf_exp_pv("^$var(match)", "^$var(keep)"))
{
    # All headers starting with $var(match) value removed,
    # except the ones starting with $var(keep) value
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_idx">
		<title>
		<function moreinfo="none">remove_hf_idx(hname, idx)</function>
		</title>
		<para>
			Remove from message the headers matching by name 'hname' with
			the index 'idx'.
		</para>
		<para>
		Returns true if the header is removed.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hname</emphasis> - header name.</para>
		</listitem>
		<listitem>
			<para><emphasis>idx</emphasis> - index of the header, starting
			from 0 with first header; negative values count from the end of
			the headers, -1 being the last header matching the name.</para>
		</listitem>
		</itemizedlist>
		<para>
			The parameters can be config variables.
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>remove_hf_idx</function> usage</title>
		<programlisting format="linespecific">
...
remove_hf_idx("X-My-Header", "-1");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_hf_match">
		<title>
		<function moreinfo="none">remove_hf_match(hname, op, expr)</function>
		</title>
		<para>
			Remove from message all headers with name 'hname' matching the body
			with expression <quote>expr</quote>, based on operator
			<quote>op</quote>.
		</para>
		<para>
		Returns true if at least one header is found and removed.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>hanem</emphasis> - name of the header.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>op</emphasis> - operator - it can be: 'eq' - equal;
			'ne' - not equal; 'in' - include; 're' - regular expression match.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>expr</emphasis> - expression to match.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>remove_hf_match</function> usage</title>
		<programlisting format="linespecific">
...
if(remove_hf_match("X-Info", "in", "^data")) {
    # all headers with name "X-Info" that have the body matching regular
    # expression "^data" are removed
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.has_body">
		<title>
		<function moreinfo="none">has_body()</function>,
		<function moreinfo="none">has_body(mime)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if the SIP message
		has a body attached. The check includes also the
		<quote>Content-Length</quote> header presence and value.
		</para>
		<para>
		If a parameter is given, the mime described will be also checked against
		the <quote>Content-Type</quote> header.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>mime</emphasis> - mime to be checked against the
				<quote>Content-Type</quote> header. If not present or 0, this
				check will be disabled.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>has_body</function> usage</title>
		<programlisting format="linespecific">
...
if(has_body("application/sdp"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_audio_on_hold">
		<title>
		<function moreinfo="none">is_audio_on_hold()</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if the SIP message
		has a body attached and at least one audio stream in on hold.
		The return code of the function indicates the detected hold type:
		<itemizedlist>
		<listitem>
			<para><emphasis>1</emphasis> - RFC2543 hold type:
			null connection IP detected
			</para>
		</listitem>
		<listitem>
			<para><emphasis>2</emphasis> - RFC3264 hold type:
			inactive or sendonly attributes detected
			</para>
		</listitem>
		</itemizedlist>
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>is_audio_on_hold</function> usage</title>
		<programlisting format="linespecific">
...
if(is_audio_on_hold())
{
    switch ($rc) {
    case 1:
        # RFC2543 hold type
        # do interesting stuff here
        break;
    case 2:
        # RFC3264 hold type
        # do interesting stuff here
        break;
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.is_privacy">
		<title>
		<function moreinfo="none">is_privacy(privacy_type)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if
                the SIP message has a Privacy header field that includes
                the given privacy_type among its privacy values.  See
				<ulink url="http://www.iana.org/assignments/sip-priv-values">
                http://www.iana.org/assignments/sip-priv-values</ulink>
                for possible privacy type values.
		</para>
   		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>is_privacy</function> usage</title>
		<programlisting format="linespecific">
...
if(is_privacy("id"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.in_list">
		<title>
			<function moreinfo="none">in_list(subject, list, separator)</function>
		</title>
		<para>
		Function checks if subject string is found in list string where list items are separated by separator string.  Subject and list strings may contain pseudo variables.  Separator string needs to be one character long.  Returns 1 if subject is found and -1 otherwise.
    	        </para>
		<para>
		Function can be used from all kinds of routes.
		</para>
		<example>
			<title><function>in_list</function> usage</title>
			<programlisting format="linespecific">
...
$var(subject) = "fi";
$var(list) = "dk,fi,no,se";
if (in_list("$var(subject)", "$var(list)", ",")) {
    xlog("L_INFO", "subject is found in list\n");
}
...
			</programlisting>
		</example>
	</section>

	<section id="textops.f.in_list_prefix">
		<title>
			<function moreinfo="none">in_list_prefix(subject, list, separator)</function>
		</title>
		<para>
		Function checks if any element in list string is a prefix for subject string where list items are separated by separator string.  Subject and list strings may contain pseudo variables.  Separator string needs to be one character long.  Returns 1 if subject is found and -1 otherwise.
    	        </para>
		<para>
		Function can be used from all kinds of routes.
		</para>
		<example>
			<title><function>in_list_prefix</function> usage</title>
			<programlisting format="linespecific">
...
$var(subject) = "final";
$var(list) = "dk,fi,no,se";
if (in_list_prefix("$var(subject)", "$var(list)", ",")) {
    xlog("L_INFO", "prefix for subject is found in list\n");
}
...
			</programlisting>
		</example>
	</section>

	<section id="textops.f.cmp_str">
		<title>
		<function moreinfo="none">cmp_str(str1, str2)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if
		the two parameters matches as string case sensitive comparison.
		</para>
   		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>cmp_str</function> usage</title>
		<programlisting format="linespecific">
...
if(cmp_str("$rU", "kamailio"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.cmp_istr">
		<title>
		<function moreinfo="none">cmp_istr(str1, str2)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if
		the two parameters matches as string case insensitive comparison.
		</para>
   		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>cmp_str</function> usage</title>
		<programlisting format="linespecific">
...
if(cmp_istr("$rU@you", "kamailio@YOU"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.starts_with">
		<title>
		<function moreinfo="none">starts_with(str1, str2)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if
		the first string starts with the second string.
		</para>
   		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>starts_with</function> usage</title>
		<programlisting format="linespecific">
...
if (starts_with("$rU", "+358"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.ends_with">
		<title>
		<function moreinfo="none">ends_with(str1, str2)</function>
		</title>
		<para>
		The function returns <emphasis>true</emphasis> if the first string ends
		with the second string. The parameters can contain variables.
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
		FAILURE_ROUTE and BRANCH_ROUTE.
		</para>
		<example>
		<title><function>ends_with</function> usage</title>
		<programlisting format="linespecific">
...
if (ends_with("$rU", "8800"))
{
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.str_find">
		<title>
		<function moreinfo="none">str_find(str1, str2)</function>
		</title>
		<para>
			The function returns <emphasis>true</emphasis> (greater than 0) if
			the str2 string is found in str1, case sensitive comparison.
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>str_find</function> usage</title>
		<programlisting format="linespecific">
...
if (str_find("$rU", "8800")) {
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.str_ifind">
		<title>
		<function moreinfo="none">str_ifind(str1, str2)</function>
		</title>
		<para>
			The function returns <emphasis>true</emphasis> (greater than 0) if
			the str2 string is found in str1, case insensitive comparison.
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>str_ifind</function> usage</title>
		<programlisting format="linespecific">
...
if (str_ifind("$rU", "Alice")) {
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.str_any_in">
		<title>
		<function moreinfo="none">str_any_in(txt, clist)</function>
		</title>
		<para>
			Return 1 (true) if any character in "clist" is found inside "txt".
			Both paramters can contain variables.
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>str_any_in</function> usage</title>
		<programlisting format="linespecific">
...
if (str_any_in("$hdr(X-Hdr)", ";',:")) {
    # do interesting stuff here
}
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.set_body_multipart">
		<title>
		<function moreinfo="none">set_body_multipart([txt, content_type][, boundary])</function>
		</title>
		<para>
		Set multipart body to a SIP message. If called with no parameters, will convert
		present body to multipart.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - text for the body, can include
				pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header,
				can include pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>boundary</emphasis> - string to use as boundary,
				can include pseudo-variables. Default: unique-boundary-1
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<para>
		The core will take care of the last boundary ending with "--", detecting which one is
		the last and fixing the others if needed.
		</para>
		<para>
		Note: it may be required that msg_apply_changes() from textopsx module
		has to be executed if there are other operations over the new body.
		</para>
		<example>
		<title><function>set_body_multipart</function> usage</title>
		<programlisting format="linespecific">
...
set_body_multipart("test", "text/plain", "delimiter");
msg_apply_changes();
append_body_part(...);
msg_apply_changes();

...

# Will produce:

...
Content-Type: multipart/mixed;boundary="delimiter"
Mime-Version: 1.0

--delimiter
Content-Type: text/plain

text

--delimiter
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.append_body_part">
		<title>
		<function moreinfo="none">append_body_part(txt, content_type[, content_disposition])</function>
		</title>
		<para>
		Append a part on multipart body SIP message. Will use "unique-boundary-1" as boundary.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - text for the multipart body, can include
				pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header,
				can include pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_disposition</emphasis> - value of Content-Disposition header,
				can include pseudo-variables.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<para>
		The core will take care of the last boundary ending with "--", detecting which one is
		the last and fixing the others if needed.
		</para>
		<para>
		Note: it may be required that msg_apply_changes() from textopsx module
		has to be executed if there are other operations over the new body.
		</para>
		<example>
		<title><function>append_body_part</function> usage</title>
		<programlisting format="linespecific">
...
$var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c";
append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext", "signal;handling=required");
msg_apply_changes();
...

# Will append this to the body:

...
Content-Type: application/vnd.cirpack.isdn-ext
Content-Disposition: signal;handling=required

7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c

--unique-boundary-1
...
</programlisting>
		</example>
		<para>
		If other headers should be added to a MIME body part, they can be
		appended after the value of the content-type parameter, separated by
		`\r\n` (at the very end do not add the '\r\n').
		</para>
		<example>
		<title><function>append_body_part</function> with headers</title>
		<programlisting format="linespecific">
...
$var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c";
append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext\r\nX-Header: xyz", "signal;handling=required");
msg_apply_changes();
...

# Will append this to the body:

...
Content-Type: application/vnd.cirpack.isdn-ext
X-Header: xyz
Content-Disposition: signal;handling=required

7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c

--unique-boundary-1
...
</programlisting>
		</example>
	</section>

		<section id="textops.f.append_body_part_hex">
		<title>
		<function moreinfo="none">append_body_part_hex(txt, content_type[, content_disposition])</function>
		</title>
		<para>
		Append a part on multipart body SIP message, with the content provided
		in hexa format. Will use "unique-boundary-1" as boundary.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>txt</emphasis> - content for the multipart body in
				hexa format. Spaces can be used between the pairs of hexa digits
				to make it easier to read in the config, they are ignored and
				not added in the body part. The parameter can include
				pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header,
				can include pseudo-variables.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>content_disposition</emphasis> - value of Content-Disposition header,
				can include pseudo-variables.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<para>
		The core will take care of the last boundary ending with "--", detecting which one is
		the last and fixing the others if needed.
		</para>
		<para>
		Note: it may be required that msg_apply_changes() from textopsx module
		has to be executed if there are other operations over the new body.
		</para>
		<example>
		<title><function>append_body_part_hex</function> usage</title>
		<programlisting format="linespecific">
...
$var(b) = "6b 61 6d 61 69 6c 69 6f";
append_body_part_hex("$var(b)", "application/my-custom-ext");
msg_apply_changes();
...

# Will append this to the body:

...
Content-Type: application/my-custom-ext

kamailio

--unique-boundary-1
...
</programlisting>
		</example>
		<para>
		If other headers should be added to a MIME body part, see the docs
		for append_body_part(...) function.
		</para>
	</section>

	<section id="textops.f.get_body_part">
		<title>
		<function moreinfo="none">get_body_part(content_type, opv)</function>
		</title>
		<para>
		Return the content of a multipart body SIP message, storing it in opv.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header
				of the part to be returned. If more than one exists the first
				occurrence will be returned.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>opv</emphasis> - variable name where to store the
				result.
			</para>
		</listitem>
		</itemizedlist>
		<para>
			This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE,
			ONREPLY_ROUTE.
		</para>

		<example>
		<title><function>get_body_part</function> usage</title>
		<programlisting format="linespecific">
...
get_body_part("application/vnd.cirpack.isdn-ext", "$var(pbody)");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.get_body_part_raw">
		<title>
		<function moreinfo="none">get_body_part_raw(content_type, opv)</function>
		</title>
		<para>
			Return the content of a multipart body SIP message, including headers and
			boundary string, storing it in opv.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header
				of the part to be returned. If more than one exists the first
				occurrence will be returned.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>opv</emphasis> - variable name where to store the
				result.
			</para>
		</listitem>
		</itemizedlist>
		<para>
			This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE,
			ONREPLY_ROUTE.
		</para>

		<example>
		<title><function>get_body_part_raw</function> usage</title>
		<programlisting format="linespecific">
...
get_body_part("application/vnd.cirpack.isdn-ext", "$var(hbody)");
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.remove_body_part">
		<title>
		<function moreinfo="none">remove_body_part(content_type)</function>
		</title>
		<para>
		Remove a part on a multipart body SIP message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>content_type</emphasis> - value of Content-Type header
				of the part to be removed. If more than one exists the first
				occurrence will be removed.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<para>
		The core will take care of the last boundary ending with "--", detecting which one is
		the last and fixing the others if needed.
		</para>
		<para>
		Note: it may be required that msg_apply_changes() from textopsx module
		has to be executed if there are other operations over the new body.
		</para>
		<example>
		<title><function>remove_body_part</function> usage</title>
		<programlisting format="linespecific">
...
remove_body_part("application/vnd.cirpack.isdn-ext");
msg_apply_changes();
...
</programlisting>
		</example>
	</section>

	<section id="textops.f.regex_substring">
		<title>
		<function moreinfo="none">regex_substring(itext, regexp, mindex, mcount, dpv)</function>
		</title>
		<para>
		Search in text with given regular expression then set dpv pseudo-variable
		with the matched token at provided index.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>itext</emphasis> - text to be searched (dynamic string)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>regexp</emphasis> - regular expression (dynamic string)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>mindex</emphasis> - index of the matched token (int or
				variable holding int)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>mcount</emphasis> - the number of maximum expected matches (int or
				variable holding int)
			</para>
		</listitem>
		<listitem>
			<para><emphasis>dpv</emphasis> - variable to be set with matched token
				(static string with a name of a variable)
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.
		</para>
		<para>
		Note that the regular expression extended is used. More info at: <ulink
		url='https://www.regular-expressions.info/posix.html'>
		https://www.regular-expressions.info/posix.html</ulink>.
		</para>
		<example>
		<title><function>_regex_substring</function> usage</title>
		<programlisting format="linespecific">
	...
	regex_substring("___ abc123def ___ ghi456 ___", "([a-z]*)([0-9]+)([a-z]*)",
			1, 3, "$var(asd)");
	xlog("L_WARN","RESULT: $var(asd)\r\n");
	------
	result:
	abc
	----
	...
	</programlisting>
		</example>
	</section>

	<section id="textops.f.via_param_rm">
		<title>
		<function moreinfo="none">via_param_rm(name, idx)</function>
		</title>
		<para>
		Remove parameter matching by name from Via body at the specified index.
		The index starts from 0 (first Via body). Negative index counts from the
		end of the list for Via header bodies (-1 is the last Via body).
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>name</emphasis> - name of the parameter
			</para>
		</listitem>
		<listitem>
			<para><emphasis>idx</emphasis> - index of the Via body.
			</para>
		</listitem>
		</itemizedlist>
		<para>The parameters can also be variables.</para>
		<para>
			This function can be used from ANY_ROUTE.
		</para>

		<example>
		<title><function>via_param_rm</function> usage</title>
		<programlisting format="linespecific">
...
via_param_rm("p1", "0");
...
</programlisting>
		</example>
	</section>

	</section>
</chapter>
