ACK / BYE transaction problem - sr-users

29 Jun 2016

Hi all

Follow scenario

Class5 system [c5] --> Loadbalancer kamailio (dispatcher module) [lbl] ---> gateway
kamailio [gw] --> carrier [carr]

I get Invites from [c5] with
Request ,To, from, contact, pid in national format 0794445566

[lbl] dispatches this to [gw]

For the [carr] I need international format.

So doing these transactions in [gw]
And sending to [carr] in international format

Request, to, from, contact, ... => 417794445566
Everything ok

Then I get a 100, 183 and even 200 from [carr]
Ack is coming from [c5] to [lbl] and [gw] - but then it stocks

The ACK is not sent to the [carr]

I kamailio log I see
DEBUG: RFC3261 transaction matching failed
DEBUG: t_lookup_request: no transaction found

So for me, the ACK cannot be assigned to a transaction and gets discarded by

if ( is_method("ACK") ) {
                                                               xlog(,"L_INFO",
"WITHINDLG ACK - not loose route\n");
                                                               if ( t_check_trans() ) {

xlog(,"L_INFO", "WITHINDLG ACK - t_check_trans() \n");
                                                                               # no
loose-route, but stateful ACK;
                                                                               # must be
an ACK after a 487
                                                                               # or e.g.
404 from upstream server
                                                                               t_relay();
                                                                               exit;
                                                               } else {

xlog(,"L_INFO", "WITHINDLG ACK - not t_check_trans() DISCARD!!\n");
                                                                               # ACK
without matching transaction ... ignore and discard

route(NATMANAGE);

#t_relay();
                                                                               #exit;

Any idea?

Problem with modifying the sip tags? Or problem with the dialog?

Thanks for helping
OIi