[SR-Users] Problem with resuming suspended transactions.

[Dmytro Bogovych]

Greetings.

We build specialized softphone for iOS. Push notifications are used to
notify user and wake up softphone app on missed calls and messages.

We used Daniel's example config script as base for own configuration
file. It has the same parts and does not differ too much. I talk about
this example: http://www.kamailio.org/events/2014-KamailioWorld/day2/26-Daniel-Constantin.Mierla-Kamailio.cfg-Async.pdf

Everything was ok for few monthes - with kamailio 4.1.2.
Few weeks ago we upgraded to 4.3.3.
Now paused calls cannot be resumed properly.

Softphone receives 500 Server error (No error 0/SL) in response

This is problem part of script:

route[RELAYRESUMED] {

        # 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 ($var(rr_target) != "")
        {
                xlog("L_INFO","Relay to $var(rr_ip):$var(rr_port)\n");
                $ru = "sip:" + $rU + "@" + $var(rr_ip) + ":" +
$var(rr_port) + ";transport=" + $var(rr_proto);
                xlog("L_INFO","Current request URI is $ru\n");
                if (!t_relay())
                        xlog("L_INFO","Cannot relay PUSHED invite.");
                        sl_reply_error();
        }
        else
        {
                xlog("L_WARN","Target proto is not set\n");
                sl_reply_error();
        }
        exit;
}

It produces log
-----
Nov 23 14:42:24 ctdsip3 /usr/local/sbin/kamailio[32141]: INFO:
<script>: resuming trasaction [23927:345343979] 1985987629
(23927:345343979)

Nov 23 14:42:24 ctdsip3 /usr/local/sbin/kamailio[32141]: INFO:
<script>: Relay to 95.133.110.17:11791

Nov 23 14:42:24 ctdsip3 /usr/local/sbin/kamailio[32141]: INFO:
<script>: Current request URI is
sip:1985987629 at 95.133.110.17:11791;transport=tls

Nov 23 14:42:24 ctdsip3 /usr/local/sbin/kamailio[32141]: ERROR: sl
[sl_funcs.c:363]: sl_reply_error(): ERROR: sl_reply_error used: No
error (0/SL)

Nov 23 14:42:24 ctdsip3 /usr/local/sbin/kamailio[32141]: INFO:
<script>: Checking FAILED messages for 1985987629: 0
-----

sl_reply_error() sends 500 with No error (0/SL) description. Later 180
& 200 are sent.

But client softphone terminates transaction already (as it handles 500
response code) .

There is no "Cannot relay PUSHED invite." message in the log however.


I will be happy to heary any idea what can be cause...

Thank you!