Hi to everyone,

I’m trying to implement a SBC for my network based on Kamailio

The base idea is putting Kamailio on a dual home machine (one public interface for clients and a private interface for media servers and database), using rtpproxy to handle the relaying from public to private network.

The only problem I got is that called client get the call as it was originated by one of the media server (the call contact is some like ext@media.server.ip), which is wrong in my opinion.

Here it is the configuration,

can you help me dealing with this?

Thank you

#!KAMAILIO

#!define WITH_MYSQL

#!define WITH_AUTH

#!define WITH_USRLOCDB

#!define WITH_NAT

#!define WITH_DISPATCHER

#

# Kamailio (OpenSER) SIP Server v4.0 - default configuration script

# - web: http://www.kamailio.org

# - git: http://sip-router.org

#

# Direct your questions about this file to: <sr-users@lists.sip-router.org>

#

# Refer to the Core CookBook at http://www.kamailio.org/dokuwiki/doku.php

# for an explanation of possible statements, functions and parameters.

#

# Several features can be enabled using '#!define WITH_FEATURE' directives:

#

# *** To run in debug mode:

# - define WITH_DEBUG

#

# *** To enable mysql:

# - define WITH_MYSQL

#

# *** To enable authentication execute:

# - enable mysql

# - define WITH_AUTH

# - add users using 'kamctl'

#

# *** To enable IP authentication execute:

# - enable mysql

# - enable authentication

# - define WITH_IPAUTH

# - add IP addresses with group id '1' to 'address' table

#

# *** To enable persistent user location execute:

# - enable mysql

# - define WITH_USRLOCDB

#

# *** To enable presence server execute:

# - enable mysql

# - define WITH_PRESENCE

#

# *** To enable nat traversal execute:

# - define WITH_NAT

# - install RTPProxy: http://www.rtpproxy.org

# - start RTPProxy:

# rtpproxy -l _your_public_ip_ -s udp:localhost:7722

#

# *** To enable PSTN gateway routing execute:

# - define WITH_PSTN

# - set the value of pstn.gw_ip

# - check route[PSTN] for regexp routing condition

#

# *** To enable database aliases lookup execute:

# - enable mysql

# - define WITH_ALIASDB

#

# *** To enable speed dial lookup execute:

# - enable mysql

# - define WITH_SPEEDDIAL

#

# *** To enable multi-domain support execute:

# - enable mysql

# - define WITH_MULTIDOMAIN

#

# *** To enable TLS support execute:

# - adjust CFGDIR/tls.cfg as needed

# - define WITH_TLS

#

# *** To enable XMLRPC support execute:

# - define WITH_XMLRPC

# - adjust route[XMLRPC] for access policy

#

# *** To enable anti-flood detection execute:

# - adjust pike and htable=>ipban settings as needed (default is

# block if more than 16 requests in 2 seconds and ban for 300 seconds)

# - define WITH_ANTIFLOOD

#

# *** To block 3XX redirect replies execute:

# - define WITH_BLOCK3XX

#

# *** To enable VoiceMail routing execute:

# - define WITH_VOICEMAIL

# - set the value of voicemail.srv_ip

# - adjust the value of voicemail.srv_port

#

# *** To enhance accounting execute:

# - enable mysql

# - define WITH_ACCDB

# - add following columns to database

#!ifdef ACCDB_COMMENT

ALTER TABLE acc ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE acc ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT '';

ALTER TABLE acc ADD COLUMN src_ip varchar(64) NOT NULL default '';

ALTER TABLE acc ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE acc ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE acc ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT '';

ALTER TABLE missed_calls ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE missed_calls ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT '';

ALTER TABLE missed_calls ADD COLUMN src_ip varchar(64) NOT NULL default '';

ALTER TABLE missed_calls ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE missed_calls ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT '';

ALTER TABLE missed_calls ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT '';

#!endif

####### Defined Values #########

# *** Value defines - IDs used later in config

#!ifdef WITH_MYSQL

# - database URL - used to connect to database server by modules such

# as: auth_db, acc, usrloc, a.s.o.

#!define DBURL “database stuff"

#!define DBASTURL "database stuff"

#!endif

#!ifdef WITH_MULTIDOMAIN

# - the value for 'use_domain' parameters

#!define MULTIDOMAIN 1

#!else

#!define MULTIDOMAIN 0

#!endif

# - flags

# FLT_ - per transaction (message) flags

# FLB_ - per branch flags

#!define FLT_ACC 1

#!define FLT_ACCMISSED 2

#!define FLT_ACCFAILED 3

#!define FLT_NATS 5

#!define FLB_NATB 6

#!define FLB_NATSIPPING 7

####### Global Parameters #########

#!ifdef WITH_DEBUG

debug=4

log_stderror=yes

#!else

debug=2

log_stderror=yes

#!endif

memdbg=5

memlog=5

log_facility=LOG_LOCAL0

fork=yes

children=4

/* uncomment the next line to disable TCP (default on) */

#disable_tcp=yes

/* uncomment the next line to disable the auto discovery of local aliases

based on reverse DNS on IPs (default on) */

#auto_aliases=no

/* add local domain aliases */

#alias="sip.mydomain.com"

/* uncomment and configure the following line if you want Kamailio to

bind on a specific interface/port/proto (default bind on all available) */

listen=udp:172.20.20.29:5060

listen=tcp:172.20.20.29:5060

listen=udp:PUBLIC IP:5060

listen=tcp:PUBLIC IP:5060

mhomed=1

/* port to listen to

* - can be specified more than once if needed to listen on many ports */

port=5060

#!ifdef WITH_TLS

enable_tls=yes

#!endif

# life time of TCP connection when there is no traffic

# - a bit higher than registration expires to cope with UA behind NAT

tcp_connection_lifetime=3605

####### Custom Parameters #########

# These parameters can be modified runtime via RPC interface

# - see the documentation of 'cfg_rpc' module.

#

# Format: group.id = value 'desc' description

# Access: $sel(cfg_get.group.id) or @cfg_get.group.id

#

asterisk.bindip = "172.20.20.80" desc "Asterisk IP Address"

asterisk.bindport = "5060" desc "Asterisk Port"

kamailio.bindip = "172.20.20.29" desc "Kamailio IP Address"

kamailio.bindport = "5060" desc "Kamailio Port"

####### Modules Section ########

# set paths to location of modules (to sources or installation folders)

#!ifdef WITH_SRCPATH

mpath="modules_k:modules"

#!else

mpath="/usr/lib/x86_64-linux-gnu/kamailio/modules/"

#!endif

#!ifdef WITH_MYSQL

loadmodule "db_mysql.so"

#!endif

loadmodule "mi_fifo.so"

loadmodule "kex.so"

loadmodule "tm.so"

loadmodule "tmx.so"

loadmodule "sl.so"

loadmodule "rr.so"

loadmodule "pv.so"

loadmodule "maxfwd.so"

loadmodule "usrloc.so"

loadmodule "registrar.so"

loadmodule "textops.so"

loadmodule "siputils.so"

loadmodule "xlog.so"

loadmodule "sanity.so"

loadmodule "ctl.so"

loadmodule "cfg_rpc.so"

loadmodule "mi_rpc.so"

loadmodule "acc.so"

#!ifdef WITH_AUTH

loadmodule "auth.so"

loadmodule "auth_db.so"

#!ifdef WITH_IPAUTH

loadmodule "permissions.so"

#!endif

#!endif

#!ifdef WITH_ALIASDB

loadmodule "alias_db.so"

#!endif

#!ifdef WITH_SPEEDDIAL

loadmodule "speeddial.so"

#!endif

#!ifdef WITH_MULTIDOMAIN

loadmodule "domain.so"

#!endif

#!ifdef WITH_PRESENCE

loadmodule "presence.so"

loadmodule "presence_xml.so"

#!endif

#!ifdef WITH_NAT

loadmodule "nathelper.so"

loadmodule "rtpproxy.so"

#!endif

#!ifdef WITH_TLS

loadmodule "tls.so"

#!endif

#!ifdef WITH_ANTIFLOOD

loadmodule "htable.so"

loadmodule "pike.so"

#!endif

#!ifdef WITH_XMLRPC

loadmodule "xmlrpc.so"

#!endif

#!ifdef WITH_DEBUG

loadmodule "debugger.so"

#!endif

#!ifdef WITH_DISPATCHER

loadmodule "dispatcher.so"

loadmodule "ipops.so"

loadmodule "sqlops.so"

#!endif

loadmodule "uac.so"

# ----------------- setting module-specific parameters ---------------

# ----- mi_fifo params -----

modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")

# ----- tm params -----

# auto-discard branches from previous serial forking leg

modparam("tm", "failure_reply_mode", 3)

# default retransmission timeout: 30sec

modparam("tm", "fr_timer", 30000)

# default invite retransmission timeout after 1xx: 120sec

modparam("tm", "fr_inv_timer", 120000)

# ----- rr params -----

# add value to ;lr param to cope with most of the UAs

modparam("rr", "enable_full_lr", 1)

# do not append from tag to the RR (no need for this script)

modparam("rr", "append_fromtag", 1)

# ----- registrar params -----

modparam("registrar", "method_filtering", 1)

/* uncomment the next line to disable parallel forking via location */

# modparam("registrar", "append_branches", 0)

/* uncomment the next line not to allow more than 10 contacts per AOR */

#modparam("registrar", "max_contacts", 10)

# ----- acc params -----

/* what special events should be accounted ? */

modparam("acc", "early_media", 0)

modparam("acc", "report_ack", 0)

modparam("acc", "report_cancels", 0)

/* by default ww do not adjust the direct of the sequential requests.

if you enable this parameter, be sure the enable "append_fromtag"

in "rr" module */

modparam("acc", "detect_direction", 0)

/* account triggers (flags) */

modparam("acc", "log_flag", FLT_ACC)

modparam("acc", "log_missed_flag", FLT_ACCMISSED)

modparam("acc", "log_extra",

"src_user=$fU;src_domain=$fd;src_ip=$si;"

"dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")

modparam("acc", "failed_transaction_flag", FLT_ACCFAILED)

/* enhanced DB accounting */

#!ifdef WITH_ACCDB

modparam("acc", "db_flag", FLT_ACC)

modparam("acc", "db_missed_flag", FLT_ACCMISSED)

modparam("acc", "db_url", DBURL)

modparam("acc", "db_extra",

"src_user=$fU;src_domain=$fd;src_ip=$si;"

"dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")

#!endif

# ----- usrloc params -----

/* enable DB persistency for location entries */

#!ifdef WITH_USRLOCDB

modparam("usrloc", "db_url", DBURL)

modparam("usrloc", "db_mode", 2)

modparam("usrloc", "use_domain", MULTIDOMAIN)

#!endif

# ----- auth_db params -----

#!ifdef WITH_AUTH

modparam("auth_db", "calculate_ha1", yes)

modparam("auth_db", "load_credentials", "")

modparam("auth_db", "user_column", "name")

modparam("auth_db", "password_column", "sippasswd")

modparam("auth_db", "db_url", DBASTURL)

modparam("auth_db", "version_table", 0)

# ----- permissions params -----

#!ifdef WITH_IPAUTH

modparam("permissions", "db_url", DBURL)

modparam("permissions", "db_mode", 1)

#!endif

#!endif

# ----- alias_db params -----

#!ifdef WITH_ALIASDB

modparam("alias_db", "db_url", DBURL)

modparam("alias_db", "use_domain", MULTIDOMAIN)

#!endif

# ----- speedial params -----

#!ifdef WITH_SPEEDDIAL

modparam("speeddial", "db_url", DBURL)

modparam("speeddial", "use_domain", MULTIDOMAIN)

#!endif

# ----- domain params -----

#!ifdef WITH_MULTIDOMAIN

modparam("domain", "db_url", DBURL)

# register callback to match myself condition with domains list

modparam("domain", "register_myself", 1)

#!endif

#!ifdef WITH_PRESENCE

# ----- presence params -----

modparam("presence", "db_url", DBURL)

# ----- presence_xml params -----

modparam("presence_xml", "db_url", DBURL)

modparam("presence_xml", "force_active", 1)

#!endif

#!ifdef WITH_NAT

# ----- rtpproxy params -----

modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722")

# ----- nathelper params -----

modparam("nathelper", "natping_interval", 30)

modparam("nathelper", "ping_nated_only", 1)

modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)

modparam("nathelper", "sipping_from", “sip:pinger@PUBLIC IP")

# params needed for NAT traversal in other modules

modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")

modparam("usrloc", "nat_bflag", FLB_NATB)

#!endif

#!ifdef WITH_TLS

# ----- tls params -----

modparam("tls", "config", "/usr/local/etc/kamailio/tls.cfg")

#!endif

#!ifdef WITH_ANTIFLOOD

# ----- pike params -----

modparam("pike", "sampling_time_unit", 2)

modparam("pike", "reqs_density_per_unit", 16)

modparam("pike", "remove_latency", 4)

# ----- htable params -----

# ip ban htable with autoexpire after 5 minutes

modparam("htable", "htable", "ipban=>size=8;autoexpire=300;")

#!endif

#!ifdef WITH_XMLRPC

# ----- xmlrpc params -----

modparam("xmlrpc", "route", "XMLRPC");

modparam("xmlrpc", "url_match", "^/RPC")

#!endif

#!ifdef WITH_DEBUG

# ----- debugger params -----

modparam("debugger", "cfgtrace", 1)

#!endif

#!ifdef WITH_DISPATCHER

# ------- Load-balancer params ------

modparam("dispatcher", "db_url”,”MYSQL STUFF")

modparam("dispatcher", "table_name", "dispatcher")

modparam("dispatcher", "setid_col", "setid")

modparam("dispatcher", "destination_col", "destination")

modparam("dispatcher", "force_dst", 1)

modparam("dispatcher", "flags", 3)

modparam("dispatcher", "dst_avp", "$avp(i:271)")

modparam("dispatcher", "grp_avp", "$avp(i:272)")

modparam("dispatcher", "cnt_avp", "$avp(i:273)")

modparam("dispatcher", "ds_ping_from", "sip:kamailio-sbc@172.20.20.29")

modparam("dispatcher", "ds_ping_interval",15)

modparam("dispatcher", "ds_probing_mode", 1)

modparam("dispatcher", "ds_ping_reply_codes", "class=2;code=403;code=404;code=484;class=3")

modparam("sqlops","sqlcon",”ca=>OTHER MYSQL STUFF")

#!endif

####### Routing Logic ########

# Main SIP request routing logic

# - processing of any incoming SIP request starts with this route

# - note: this is the same as route { ... }

request_route {

# per request initial checks

route(REQINIT);

# NAT detection

route(NATDETECT);

# handle requests within SIP dialogs

route(WITHINDLG);

### only initial requests (no To tag)

# CANCEL processing

if (is_method("CANCEL"))

{

if (t_check_trans())

t_relay();

exit;

}

t_check_trans();

# authentication

route(AUTH);

# record routing for dialog forming requests (in case they are routed)

# - remove preloaded route headers

remove_hf("Route");

if (is_method("INVITE|SUBSCRIBE"))

record_route();

# account only INVITEs

if (is_method("INVITE"))

{

setflag(FLT_ACC); # do accounting

}

# handle presence related requests

route(PRESENCE);

# handle registrations

route(REGISTRAR);

if ($rU==$null)

{

# request with no Username in RURI

sl_send_reply("484","Address Incomplete");

exit;

}

# user location service

route(LOCATION);

route(RELAY);

}

# Per SIP request initial checks

route[REQINIT] {

#!ifdef WITH_ANTIFLOOD

# flood dection from same IP and traffic ban for a while

# be sure you exclude checking trusted peers, such as pstn gateways

# - local host excluded (e.g., loop to self)

if(src_ip!=myself)

{

if($sht(ipban=>$si)!=$null)

{

# ip is already blocked

xdbg("request from blocked IP - $rm from $fu (IP:$si:$sp)\n");

exit;

}

if (!pike_check_req())

{

xlog("L_ALERT","ALERT: pike blocking $rm from $fu (IP:$si:$sp)\n");

$sht(ipban=>$si) = 1;

exit;

}

}

#!endif

if (!mf_process_maxfwd_header("10")) {

sl_send_reply("483","Too Many Hops");

exit;

}

if(!sanity_check("1511", "7"))

{

xlog("Malformed SIP message from $si:$sp\n");

exit;

}

}

# Handle requests within SIP dialogs

route[WITHINDLG] {

if (has_totag()) {

# sequential request withing a dialog should

# take the path determined by record-routing

if (loose_route()) {

if (is_method("BYE")) {

setflag(FLT_ACC); # do accounting ...

setflag(FLT_ACCFAILED); # ... even if the transaction fails

}

if ( is_method("ACK") ) {

# ACK is forwarded statelessy

route(NATMANAGE);

}

route(RELAY);

} else {

if (is_method("SUBSCRIBE") && uri == myself) {

# in-dialog subscribe requests

route(PRESENCE);

exit;

}

if ( is_method("ACK") ) {

if ( t_check_trans() ) {

# no loose-route, but stateful ACK;

# must be an ACK after a 487

# or e.g. 404 from upstream server

t_relay();

exit;

} else {

# ACK without matching transaction ... nore and discard

exit;

}

}

sl_send_reply("404","Not here");

}

exit;

}

}

# Caller NAT detection route

route[NATDETECT] {

#!ifdef WITH_NAT

force_rport();

if (nat_uac_test("19")) {

if (is_method("REGISTER")) {

fix_nated_register();

} else {

fix_nated_contact();

}

setflag(FLT_NATS);

}

#!endif

return;

}

# Authentication route

route[AUTH] {

#if(route(FROMASTERISK))

# return;

# if caller is not local subscriber, then check if it calls

# a local destination, otherwise deny, not an open relay here

if (from_uri!=myself && uri!=myself)

{

sl_send_reply("403","Not relaying");

exit;

}

#!ifdef WITH_AUTH

#!ifdef WITH_IPAUTH

if((!is_method("REGISTER")) && allow_source_address())

{

# source IP allowed

return;

}

#!endif

if (is_method("REGISTER") || from_uri==myself)

{

# authenticate requests

if (!auth_check("$fd", "sipusers", "1")) {

auth_challenge("$fd", "0");

exit;

}

# user authenticated - remove auth header

if(!is_method("REGISTER|PUBLISH"))

consume_credentials();

}

#!endif

return;

}

# Presence server route

route[PRESENCE] {

if(!is_method("PUBLISH|SUBSCRIBE"))

return;

#!ifdef WITH_PRESENCE

if (!t_newtran())

{

sl_reply_error();

exit;

};

if(is_method("PUBLISH"))

{

handle_publish();

t_release();

}

else

if( is_method("SUBSCRIBE"))

{

handle_subscribe();

t_release();

}

exit;

#!endif

# if presence enabled, this part will not be executed

if (is_method("PUBLISH") || $rU==$null)

{

sl_send_reply("404", "Not here");

exit;

}

return;

}

# Handle SIP registrations

route[REGISTRAR] {

if (is_method("REGISTER"))

{

if(isflagset(FLT_NATS))

{

setbflag(FLB_NATB);

# uncomment next line to do SIP NAT pinging

setbflag(FLB_NATSIPPING);

}

if (!save("location"))

sl_reply_error();

route(REGFWD);

exit;

}

}

# USER location service

route[LOCATION] {

if(is_method("INVITE") && (!route(FROMASTERISK))) {

# if new call from out there - send to Asterisk

# - non-INVITE request are routed directly by Kamailio

# - traffic from Asterisk is routed also directy by Kamailio

route(TOASTERISK);

exit;

}

$avp(oexten) = $rU;

if (!lookup("location")) {

$var(rc) = $rc;

t_newtran();

switch ($var(rc)) {

case -1:

case -3:

send_reply("404", "Not Found");

exit;

case -2:

send_reply("405", "Method Not Allowed");

exit;

}

}

# when routing via usrloc, log the missed calls also

if (is_method("INVITE"))

{

setflag(FLT_ACCMISSED);

}

}

route[RELAY] {

# enable additional event routes for forwarded requests

# - serial forking, RTP relaying handling, a.s.o.

if (is_method("INVITE|SUBSCRIBE")) {

t_on_branch("MANAGE_BRANCH");

t_on_reply("MANAGE_REPLY");

}

if (is_method("INVITE")) {

t_on_failure("MANAGE_FAILURE");

}

if (!t_relay()) {

sl_reply_error();

}

exit;

}

# RTPProxy control

route[NATMANAGE] {

#!ifdef WITH_NAT

if (is_request()) {

if(has_totag()) {

if(check_route_param("nat=yes")) {

setbflag(FLB_NATB);

}

}

}

if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB)))

return;

route(RTPPROXY);

if (is_request()) {

if (!has_totag()) {

add_rr_param(";nat=yes");

}

}

if (is_reply()) {

if(isbflagset(FLB_NATB)) {

fix_nated_contact();

}

}

#!endif

return;

}

# manage incoming replies

onreply_route[MANAGE_REPLY] {

xdbg("incoming reply\n");

if(status=~"[12][0-9][0-9]")

route(NATMANAGE);

}

# manage failure routing cases

failure_route[MANAGE_FAILURE] {

route(NATMANAGE);

if (t_is_canceled()) {

exit;

}

}

# RTPProxy control

route[RTPPROXY] {

if (is_method("INVITE")){

sql_query("ca", "select destination from dispatcher where destination like '%$dd%'","ra");

if($dbr(ra=>rows)>0){

$avp(duip)=$(du{s.select,-2,:});

if (is_ip_rfc1918("$avp(duip)")) {

xlog("L_INFO", "Call is going to private IPv4 Media Server Engage RTPProxy Now\n");

rtpproxy_manage("cwei","172.20.20.29");

#rtpproxy_manage("rwei");

}

}

else if(ds_is_from_list()){

if (is_ip_rfc1918("$si")) {

xlog("L_INFO", " Call is coming from a private IPv4 Media Server Engage RTPProxy Now\n");

rtpproxy_manage("cwie”,”PUBLIC IP");

#rtpproxy_manage("rwie");

}

}else if(!ds_is_from_list()){

rtpproxy_manage("rwei");

xlog("L_INFO", "NONE! RTP PROXY BOH\n");

}

}

}

# Send to Asterisk

route[TOASTERISK] {

ds_mark_dst("P");

if(!ds_select_dst("1", "4")) {

sl_send_reply("500", "Service Unavailable");

xlog("L_INFO","[$fU@$si:$sp]{$rm} No destinations available for $rd \n");

exit;

}

xlog("L_INFO","[$fU@$si:$sp]{$rm} From Outside World to Asterisk Box $du\n");

rtpproxy_manage("cawie");

route(RELAY);

exit;

}

# Test if coming from Asterisk

route[FROMASTERISK] {

if(ds_is_from_list()){

rtpproxy_manage("cawei");

xlog("L_INFO","[$fU@$si:$sp]{$rm} Call from Media-Server Cluster\n");

return 1;

}

return -1;

}

route[REGFWD] {

xlog("L_INFO","regfwd "+"sip:" +"\n");

if(!is_method("REGISTER"))

{

return;

}

$var(rip) = $sel(cfg_get.asterisk.bindip);

$uac_req(method)="REGISTER";

$uac_req(ruri)="sip:" + $var(rip) + ":" + $sel(cfg_get.asterisk.bindport);

$uac_req(furi)="sip:" + $au + "@" + $var(rip);

$uac_req(turi)="sip:" + $au + "@" + $var(rip);

$uac_req(hdrs)="Contact: <sip:" + $au + "@"

+ $sel(cfg_get.kamailio.bindip)

+ ":" + $sel(cfg_get.kamailio.bindport) + ">\r\n";

if($sel(contact.expires) != $null)

$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " + $sel(contact.expires) + "\r\n";

else

$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " + $hdr(Expires) + "\r\n";

uac_req_send();

}

--
Alex
PRE s.r.l.
Backbone Network Mission Control

System Engineering&Architecture Task Force

alex@presrl.net

http://www.presrl.it

+39 0971 471 430

+39 388 150 6886

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