michael@13: Index: modules/enum/enum_mod.h
michael@13: diff -Nau modules/enum/enum_mod.h.orig modules/enum/enum_mod.h
michael@13: --- modules/enum/enum_mod.h.orig	2010-01-18 15:54:52.842465412 +0100
michael@13: +++ modules/enum/enum_mod.h	2010-01-18 15:55:20.812190874 +0100
michael@13: @@ -41,5 +41,7 @@
michael@13:  extern str i_branchlabel;    /* the label branching off the infrastructure tree */
michael@13:  extern str i_bl_alg;         /* how to know where to branch off */
michael@13:  
michael@13: +extern str isnsuffix;        /* str version of isn_suffix */
michael@13: +
michael@13:  
michael@13:  #endif /* ENUM_MOD_H */
michael@13: Index: modules/enum/enum_mod.c
michael@13: diff -Nau modules/enum/enum_mod.c.orig modules/enum/enum_mod.c
michael@13: --- modules/enum/enum_mod.c.orig	2010-01-18 15:52:57.316263519 +0100
michael@13: +++ modules/enum/enum_mod.c	2010-01-18 15:52:42.844229824 +0100
michael@13: @@ -55,6 +55,8 @@
michael@13:  char* i_enum_suffix = "e164.arpa.";
michael@13:  char* bl_algorithm = "cc";
michael@13:  
michael@13: +char* isn_suffix = "freenum.org.";
michael@13: +
michael@13:  
michael@13:  /*
michael@13:   * Internal module variables
michael@13: @@ -67,6 +69,8 @@
michael@13:  str i_branchlabel;
michael@13:  str i_bl_alg;
michael@13:  
michael@13: +str isnsuffix;
michael@13: +
michael@13:  
michael@13:  /*
michael@13:   * Exported functions
michael@13: @@ -94,6 +98,11 @@
michael@13:  	 REQUEST_ROUTE},
michael@13:  	{"i_enum_query", (cmd_function)i_enum_query_2, 2, fixup_str_str, 0,
michael@13:  	 REQUEST_ROUTE},
michael@13: +	{"isn_query", (cmd_function)isn_query_0, 0, 0, 0, REQUEST_ROUTE},
michael@13: +	{"isn_query", (cmd_function)isn_query_1, 1, fixup_str_null,
michael@13: +	 fixup_free_str_null, REQUEST_ROUTE},
michael@13: +	{"isn_query", (cmd_function)isn_query_2, 2, fixup_str_str, 
michael@13: +	 fixup_free_str_str, REQUEST_ROUTE},
michael@13:  	{0, 0, 0, 0, 0, 0}
michael@13:  };
michael@13:  
michael@13: @@ -107,6 +116,7 @@
michael@13:  	{"branchlabel", STR_PARAM, &branchlabel},
michael@13:  	{"i_enum_suffix", STR_PARAM, &i_enum_suffix},
michael@13:  	{"bl_algorithm", STR_PARAM, &bl_algorithm},
michael@13: +	{"isn_suffix", STR_PARAM, &isn_suffix},
michael@13:  	{0, 0, 0}
michael@13:  };
michael@13:  
michael@13: @@ -152,6 +162,9 @@
michael@13:  	i_bl_alg.s = bl_algorithm;
michael@13:  	i_bl_alg.len = strlen(bl_algorithm);
michael@13:  
michael@13: +	isnsuffix.s = isn_suffix;
michael@13: +	isnsuffix.len = strlen(isn_suffix.s);
michael@13: +
michael@13:  	return 0;
michael@13:  }
michael@13:  
michael@13: Index: modules/enum/enum.h
michael@13: diff -Nau modules/enum/enum.h.orig modules/enum/enum.h
michael@13: --- modules/enum/enum.h.orig	2010-01-18 15:54:40.361624448 +0100
michael@13: +++ modules/enum/enum.h	2010-01-18 15:54:43.090330399 +0100
michael@13: @@ -66,5 +66,13 @@
michael@13:  int i_enum_query_1(struct sip_msg* _msg, char* _suffix, char* _str2);
michael@13:  int i_enum_query_2(struct sip_msg* _msg, char* _suffix, char* _service);
michael@13:  
michael@13: +/*
michael@13: + * Make ISN query and if query succeeds, replace current uri with the
michael@13: + * result of the query
michael@13: + */
michael@13: +int isn_query_0(struct sip_msg* _msg, char* _str1, char* _str2);
michael@13: +int isn_query_1(struct sip_msg* _msg, char* _suffix, char* _str2);
michael@13: +int isn_query_2(struct sip_msg* _msg, char* _suffix, char* _service);
michael@13: +
michael@13:  
michael@13:  #endif /* ENUM_H */
michael@13: Index: modules/enum/enum.c
michael@13: diff -Nau modules/enum/enum.c.orig modules/enum/enum.c
michael@13: --- modules/enum/enum.c.orig	2010-01-18 15:57:10.995902181 +0100
michael@13: +++ modules/enum/enum.c	2010-01-18 15:46:19.642209178 +0100
michael@13: @@ -736,6 +736,84 @@
michael@13:  }
michael@13:  
michael@13:  
michael@13: +/*
michael@13: + * Call isn_query_2 with module parameter suffix and default service.
michael@13: + */
michael@13: +int isn_query_0(struct sip_msg* _msg, char* _str1, char* _str2)
michael@13: +{
michael@13: +	return isn_query_2(_msg, (char *)(&isnsuffix), (char *)(&service));
michael@13: +}
michael@13: +
michael@13: +
michael@13: +/*
michael@13: + * Call isn_query_2 with given suffix and default service.
michael@13: + */
michael@13: +int isn_query_1(struct sip_msg* _msg, char* _suffix, char* _str2)
michael@13: +{
michael@13: +	return isn_query_2(_msg, _suffix, (char *)(&service));
michael@13: +}
michael@13: +
michael@13: +
michael@13: +/*
michael@13: + * See documentation in README file.
michael@13: + */
michael@13: +int isn_query_2(struct sip_msg* _msg, char* _suffix, char* _service)
michael@13: +{
michael@13: +	char *user_s = NULL;
michael@13: +	int user_len, i, j;
michael@13: +	char name[MAX_DOMAIN_SIZE] = {0};
michael@13: +	char string[17] = {0};
michael@13: +	char szItad[17] = {0};
michael@13: +	size_t nItlen = 0;
michael@13: +
michael@13: +	str *suffix, *service;
michael@13: +
michael@13: +	suffix = (str*)_suffix;
michael@13: +	service = (str*)_service;
michael@13: +
michael@13: +	if (parse_sip_msg_uri(_msg) < 0) {
michael@13: +		LM_ERR("Parsing of R-URI failed\n");
michael@13: +		return -1;
michael@13: +	}
michael@13: +
michael@13: +	user_s = _msg->parsed_uri.user.s;
michael@13: +	user_len = _msg->parsed_uri.user.len;
michael@13: +
michael@13: +	memcpy(&(string[0]), user_s, user_len);
michael@13: +	string[user_len] = (char)0;
michael@13: +
michael@13: +	/* Do primitive test for correct ISN format, */
michael@13: +	/* and set szItad to the ISN ITAD (RFC 3872/2871). */
michael@13: +	/* Correct ISN format guessed from freenum.org and IANA */
michael@13: +	/* doc http://www.iana.org/assignments/trip-parameters/ */
michael@13: +	{
michael@13: +		char *pAster = strchr(string, '*');
michael@13: +		if (pAster && (nItlen = strspn(pAster + sizeof(char), "0123456789")))
michael@13: +			strncpy(szItad, pAster + sizeof(char), nItlen);
michael@13: +		else {
michael@13: +			LM_ERR("R-URI user does not contain a valid ISN\n");
michael@13: +			return -1;
michael@13: +		}
michael@13: +	}
michael@13: +
michael@13: +	/* Ammend the original ENUM E.164 string logic to process */
michael@13: +	/* ISN numbers instead, which include a nonreversed ITAD. */
michael@13: +	i = user_len - nItlen - sizeof(char); /* Ex: *1212 */
michael@13: +	j = 0;
michael@13: +	while (i--) {
michael@13: +		name[j] = user_s[i];
michael@13: +		name[j + 1] = '.';
michael@13: +		j = j + 2;
michael@13: +	}
michael@13: +
michael@13: +	strcat(name + j, szItad);  /* Copy the unreversed ITAD, */
michael@13: +	name[j + nItlen] = '.';    /* and append a trailing dot. */
michael@13: +	memcpy(name + j + nItlen + sizeof(char), suffix->s, suffix->len + 1);
michael@13: +
michael@13: +	return do_query(_msg, string, name, service);
michael@13: +}
michael@13: +
michael@13: +
michael@13:  /*********** INFRASTRUCTURE ENUM ***************/
michael@13:  
michael@13:  /*
michael@13: Index: modules/enum/README
michael@13: diff -Nau modules/enum/README.orig modules/enum/README
michael@13: --- modules/enum/README.orig	2010-01-18 17:59:52.034172367 +0100
michael@13: +++ modules/enum/README	2010-01-18 18:01:30.730633377 +0100
michael@13: @@ -10,8 +10,8 @@
michael@13:  
michael@13:     Copyright © 2002, 2003 Juha Heinanen
michael@13:     Revision History
michael@13: -   Revision $Revision: 5906 $ $Date: 2009-07-21 10:45:05 +0300
michael@13: -                              (Tue, 21 Jul 2009) $
michael@13: +   Revision $Revision: 5907 $ $Date: 2010-01-18 10:45:05 +0100
michael@13: +                              (Mon, 18 Jan 2010) $
michael@13:       __________________________________________________________
michael@13:  
michael@13:     Table of Contents
michael@13: @@ -25,28 +25,32 @@
michael@13:                1.3.1. domain_suffix (string)
michael@13:                1.3.2. tel_uri_params (string)
michael@13:                1.3.3. i_enum_suffix (string)
michael@13: -              1.3.4. branchlabel (string)
michael@13: -              1.3.5. bl_algorithm (string)
michael@13: +              1.3.4. isn_suffix (string)
michael@13: +              1.3.5. branchlabel (string)
michael@13: +              1.3.6. bl_algorithm (string)
michael@13:  
michael@13:          1.4. Exported Functions
michael@13:  
michael@13:                1.4.1. enum_query(["suffix"[,"service"]])
michael@13:                1.4.2. enum_pv_query("pvar"[,"suffix"[,"service"]])
michael@13:                1.4.3. i_enum_query(["suffix"[,"service"]])
michael@13: -              1.4.4. is_from_user_enum()
michael@13: +              1.4.4. isn_query(["suffix"[,"service"]])
michael@13: +              1.4.5. is_from_user_enum()
michael@13:  
michael@13:     List of Examples
michael@13:  
michael@13:     1.1. Setting domain_suffix module parameter
michael@13:     1.2. Setting tel_uri_params module parameter
michael@13:     1.3. Setting i_enum_suffix module parameter
michael@13: -   1.4. Setting brachlabel module parameter
michael@13: -   1.5. Zone file example
michael@13: +   1.4. Setting isn_query usage module parameter
michael@13: +   1.5. Setting branchlabel module parameter
michael@13:     1.6. Zone file example
michael@13: -   1.7. Setting the bl_algorithm module parameter
michael@13: -   1.8. enum_query usage
michael@13: -   1.9. enum_pv_query usage
michael@13: -   1.10. is_from_user_enum usage
michael@13: +   1.7. Zone file example
michael@13: +   1.8. Setting the bl_algorithm module parameter
michael@13: +   1.9. enum_query usage
michael@13: +   1.10. enum_pv_query usage
michael@13: +   1.11. isn_query usage
michael@13: +   1.12. is_from_user_enum usage
michael@13:  
michael@13:  Chapter 1. Admin Guide
michael@13:  
michael@13: @@ -113,6 +117,22 @@
michael@13:     function does an enum lookup on the from user and returns true
michael@13:     if found, false otherwise.
michael@13:  
michael@13: +   In addition to standard ENUM, support for ISN (ITAD Subscriber
michael@13: +   Numbers) is provided as well. To allow ISN lookups to resolve,
michael@13: +   a different formatting algorithm is expected by the DNS server.
michael@13: +   Whereas a ENUM NAPTR record expects a DNS query of the form
michael@13: +   9.8.7.6.5.4.3.2.1.<suffix>, ISN method expects a DNS query of
michael@13: +   the form 6.5.1212.<suffix>. That is, a valid ISN number includes
michael@13: +   a prefix of '56' in the example. The rest of the number is a
michael@13: +   ITAD (Internet Telephony Administrative Domain) as defined
michael@13: +   in RFCs 3872 and 2871, and as allocated by the IANA in
michael@13: +   http://www.iana.org/assignments/trip-parameters. The ITAD is
michael@13: +   left intact and not refersed as ENUM requires. To learn more
michael@13: +   about ISN please refer to documents at www.freenum.org.
michael@13: +
michael@13: +   To complete a ISN lookup on the user part of the Request-URI,
michael@13: +   isn_query() is used instead of enum_query().
michael@13: +
michael@13:  1.2. Dependencies
michael@13:  
michael@13:     The module depends on the following modules (in the other words
michael@13: @@ -158,17 +178,27 @@
michael@13:     Example 1.3. Setting i_enum_suffix module parameter
michael@13:  modparam("enum", "i_enum_suffix", "e1234.arpa.")
michael@13:  
michael@13: -1.3.4. branchlabel (string)
michael@13: +1.3.4. isn_suffix (string)
michael@13: +
michael@13: +   The domain suffix to be used for isn_query() lookups. Can be
michael@13: +   overridden by a parameter to isn_query.
michael@13: +
michael@13: +   Default value is "freenum.org."
michael@13: +
michael@13: +   Example 1.4. Setting isn_suffix module parameter
michael@13: +modparam("enum", "isn_suffix", "freenum.org.")
michael@13: +
michael@13: +1.3.5. branchlabel (string)
michael@13:  
michael@13:     This parameter determines which label i_enum_query() will use
michael@13:     to branch off to the infrastructure ENUM tree.
michael@13:  
michael@13:     Default value is ""i""
michael@13:  
michael@13: -   Example 1.4. Setting brachlabel module parameter
michael@13: +   Example 1.5. Setting branchlabel module parameter
michael@13:  modparam("enum", "branchlabel", "i")
michael@13:  
michael@13: -1.3.5. bl_algorithm (string)
michael@13: +1.3.6. bl_algorithm (string)
michael@13:  
michael@13:     This parameter determines which algorithm i_enum_query() will
michael@13:     use to select the position in the DNS tree where the
michael@13: @@ -182,7 +212,7 @@
michael@13:     [branchlabel].[reverse-country-code].[i_enum_suffix] to
michael@13:     indicate after how many digits the label should in inserted.
michael@13:  
michael@13: -   Example 1.5. Zone file example
michael@13: +   Example 1.6. Zone file example
michael@13:  i.1.e164.arpa.                     IN TXT   "4"
michael@13:  9.9.9.8.7.6.5.i.4.3.2.1.e164.arpa. IN NAPTR "NAPTR content for  +1 234 5
michael@13:  678 999"
michael@13: @@ -196,7 +226,7 @@
michael@13:     allocated yet. This version of the code uses 65300. See
michael@13:     resolve.h.
michael@13:  
michael@13: -   Example 1.6. Zone file example
michael@13: +   Example 1.7. Zone file example
michael@13:  i.1.e164.arpa.     TYPE65300  \# 14 (
michael@13:                                04    ; position
michael@13:                                01 69 ; separator
michael@13: @@ -208,7 +238,7 @@
michael@13:  
michael@13:     Default value is "cc"
michael@13:  
michael@13: -   Example 1.7. Setting the bl_algorithm module parameter
michael@13: +   Example 1.8. Setting the bl_algorithm module parameter
michael@13:  modparam("enum", "bl_algorithm", "txt")
michael@13:  
michael@13:  1.4. Exported Functions
michael@13: @@ -225,7 +255,7 @@
michael@13:  
michael@13:     This function can be used from REQUEST_ROUTE.
michael@13:  
michael@13: -   Example 1.8. enum_query usage
michael@13: +   Example 1.9. enum_query usage
michael@13:  ...
michael@13:  # search for "e2u+sip" in freenum.org
michael@13:  enum_query("freenum.org.");
michael@13: @@ -262,7 +292,7 @@
michael@13:  
michael@13:     This function can be used from REQUEST_ROUTE.
michael@13:  
michael@13: -   Example 1.9. enum_pv_query usage
michael@13: +   Example 1.10. enum_pv_query usage
michael@13:  ...
michael@13:  # search for "e2u+sip" in freenum.org
michael@13:  enum_pv_query("$avp(i:100)", "freenum.org.");
michael@13: @@ -296,14 +326,42 @@
michael@13:     ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-haberle
michael@13:     r-carrier-enum-01.txt for the rationale behind this function.
michael@13:  
michael@13: -1.4.4. is_from_user_enum()
michael@13: +1.4.4.  isn_query(["suffix"[,"service"]])
michael@13: +
michael@13: +   The function performs a ISN query and rewrites the
michael@13: +   Request-URI with the result of the query. See Section 1.1,
michael@13: +   "Overview" for more information.
michael@13: +
michael@13: +   Meaning of the parameters is as follows:
michael@13: +     * suffix - Suffix to be appended to the domain name.
michael@13: +     * service - Service string to be used in the service field.
michael@13: +
michael@13: +   This function can be used from REQUEST_ROUTE.
michael@13: +
michael@13: +   See ftp://www.ietf.org/rfc/rfc3872.txt and
michael@13: +   ftp://www.ietf.org/rfc/rfc2871.txt for information
michael@13: +   regarding the ITAD part of the ISN string.
michael@13: +
michael@13: +   Example 1.11. isn_query usage
michael@13: +...
michael@13: +# search for "e2u+sip" in freenum.org
michael@13: +isn_query("freenum.org.");
michael@13: +...
michael@13: +# search for "e2u+sip" in default tree (configured as parameter)
michael@13: +enum_query();
michael@13: +...
michael@13: +# search for "e2u+voice:sip" in freenum.org
michael@13: +enum_query("freenum.org.","voice");
michael@13: +...
michael@13: +
michael@13: +1.4.5. is_from_user_enum()
michael@13:  
michael@13:     Checks if the user part of from URI is found in an enum lookup.
michael@13:     Returns 1 if yes and -1 if not.
michael@13:  
michael@13:     This function can be used from REQUEST_ROUTE.
michael@13:  
michael@13: -   Example 1.10. is_from_user_enum usage
michael@13: +   Example 1.12. is_from_user_enum usage
michael@13:  ...
michael@13:  if (is_from_user_enum()) {
michael@13:          ....
michael@13: Index: modules/enum/doc/enum.xml
michael@13: diff -Nau modules/enum/doc/enum.xml.orig modules/enum/doc/enum.xml
michael@13: --- modules/enum/doc/enum.xml.orig	2009-10-16 02:31:52.000000000 +0200
michael@13: +++ modules/enum/doc/enum.xml	2010-01-18 18:01:15.954172402 +0100
michael@13: @@ -33,8 +33,8 @@
michael@13:  	</copyright>
michael@13:  	<revhistory>
michael@13:  	    <revision>
michael@13: -		<revnumber>$Revision: 5901 $</revnumber>
michael@13: -		<date>$Date: 2009-07-21 10:45:05 +0300 (Tue, 21 Jul 2009) $</date>
michael@13: +		<revnumber>$Revision: 5907 $</revnumber>
michael@13: +		<date>$Date: 2010-01-18 10:45:05 +0100 (Mon, 18 Jan 2010) $</date>
michael@13:  	    </revision>
michael@13:  	</revhistory>
michael@13:      </bookinfo>
michael@13: Index: modules/enum/doc/enum_admin.xml
michael@13: diff -Nau modules/enum/doc/enum_admin.xml.orig modules/enum/doc/enum_admin.xml
michael@13: --- modules/enum/doc/enum_admin.xml.orig	2010-01-18 12:33:30.053644000 +0100
michael@13: +++ modules/enum/doc/enum_admin.xml	2010-01-18 18:14:59.583157910 +0100
michael@13: @@ -75,6 +75,24 @@
michael@13:  		and -1 if not.
michael@13:  	</para>
michael@13:  	<para>
michael@13: +		In addition to standard ENUM, support for ISN (ITAD Subscriber
michael@13: +		Numbers) is provided as well. To allow ISN lookups to resolve,
michael@13: +		a different formatting algorithm is expected by the DNS server.
michael@13: +		Whereas a ENUM NAPTR record expects a DNS query of the form
michael@13: +		9.8.7.6.5.4.3.2.1.<suffix>, ISN method expects a DNS query of
michael@13: +		the form 6.5.1212.<suffix>. That is, a valid ISN number includes
michael@13: +		a prefix of '56' in the example. The rest of the number is a
michael@13: +		ITAD (Internet Telephony Administrative Domain) as defined
michael@13: +		in RFCs 3872 and 2871, and as allocated by the IANA in
michael@13: +		http://www.iana.org/assignments/trip-parameters. The ITAD is
michael@13: +		left intact and not refersed as ENUM requires. To learn more
michael@13: +		about ISN please refer to documents at www.freenum.org.
michael@13: +	</para>
michael@13: +	<para>
michael@13: +		To complete a ISN lookup on the user part of the Request-URI,
michael@13: +		isn_query() is used instead of enum_query().
michael@13: +	</para>
michael@13: +	<para>
michael@13:  		Enum module also implements is_from_user_enum function.
michael@13:  		This function does an enum lookup on the from user and
michael@13:  		returns true if found, false otherwise.
michael@13: @@ -153,6 +171,22 @@
michael@13:                  </example>
michael@13:          </section>
michael@13:          <section>
michael@13: +                <title><varname>isn_suffix</varname> (string)</title>
michael@13: +                <para>
michael@13: +                The domain suffix to be used for isn_query() lookups. Can
michael@13: +                be overridden by a parameter to isn_query.
michael@13: +                </para>
michael@13: +                <para>
michael@13: +                Default value is <quote>freenum.org.</quote>
michael@13: +                </para>
michael@13: +                <example>
michael@13: +                <title>Setting isn_suffix module parameter</title>
michael@13: +                <programlisting format="linespecific">
michael@13: +modparam("enum", "isn_suffix", "freenum.org.")
michael@13: +</programlisting>
michael@13: +                </example>
michael@13: +        </section>
michael@13: +        <section>
michael@13:                  <title><varname>branchlabel</varname> (string)</title>
michael@13:                  <para>
michael@13:                  This parameter determines which label i_enum_query() will use
michael@13: @@ -162,7 +196,7 @@
michael@13:                  Default value is <quote>"i"</quote>
michael@13:                  </para>
michael@13:                  <example>
michael@13: -                <title>Setting brachlabel module parameter</title>
michael@13: +                <title>Setting branchlabel module parameter</title>
michael@13:                  <programlisting format="linespecific">
michael@13:  modparam("enum", "branchlabel", "i")
michael@13:  </programlisting>
michael@13: @@ -353,6 +387,53 @@
michael@13:          </section>
michael@13:  
michael@13:  	<section>
michael@13: +		<title>
michael@13: +		<function moreinfo="none">isn_query(["suffix"[,"service"]])</function>
michael@13: +		</title>
michael@13: +		<para>
michael@13: +		The function performs a ISN query and rewrites the Request-URI with 
michael@13: +		the result of the query. See <xref linkend="sec-overview"/> for more 
michael@13: +		information.
michael@13: +		</para>
michael@13: +		<para>Meaning of the parameters is as follows:</para>
michael@13: +		<itemizedlist>
michael@13: +		<listitem>
michael@13: +			<para><emphasis>suffix</emphasis> - Suffix to be appended to the 
michael@13: +			domain name.
michael@13: +			</para>
michael@13: +		</listitem>
michael@13: +		<listitem>
michael@13: +			<para><emphasis>service</emphasis> - Service string to be used in 
michael@13: +			the service field.
michael@13: +			</para>
michael@13: +		</listitem>
michael@13: +		</itemizedlist>
michael@13: +		<para>
michael@13: +			This function can be used from REQUEST_ROUTE.
michael@13: +		</para>
michael@13: +		<para>
michael@13: +			See ftp://www.ietf.org/rfc/rfc3872.txt and
michael@13: +			ftp://www.ietf.org/rfc/rfc2871.txt for information
michael@13: +			regarding the ITAD part of the ISN string.
michael@13: +		</para>
michael@13: +		<example>
michael@13: +		<title><function moreinfo="none">isn_query</function> usage</title>
michael@13: +		<programlisting format="linespecific">
michael@13: +...
michael@13: +# search for "e2u+sip" in freenum.org 
michael@13: +isn_query("freenum.org.");
michael@13: +...
michael@13: +# search for "e2u+sip" in default tree (configured as parameter)
michael@13: +isn_query();
michael@13: +...
michael@13: +# search for "e2u+voice:sip" in freenum.org
michael@13: +isn_query("freenum.org.","voice");
michael@13: +...
michael@13: +</programlisting>
michael@13: +		</example>
michael@13: +	</section>
michael@13: +
michael@13: +	<section>
michael@13:  		<title><function moreinfo="none">is_from_user_enum()</function></title>
michael@13:  		<para>
michael@13:  		Checks if the user part of from <abbrev>URI</abbrev>