[Kamailio-Users] Trying to deliver a call across multiple peers with t_relay

[Tyler Brauer]

Thank you Klaus for the suggestions. I've implemented the
configuration below. When the first t_relay fails, Kamailio generates
the 408 Request Timeout and doesn't attempt to try an INVITE to the
second address. This what the syslog says:

Nov 28 06:11:13 server kamailio[1315]: Attempting Carrier 1
Nov 28 06:11:28 server kamailio[1323]: Attempting Carrier 2
Nov 28 06:11:28 server kamailio[1323]: ERROR:tm:t_forward_nonack: no
branch for forwarding
Nov 28 06:11:28 server kamailio[1323]: ERROR:tm:w_t_relay:
t_forward_nonack failed
Nov 28 06:11:28 server kamailio[1317]: Attempting Carrier 1

And here's the watered-down version of my configuration.

# - - - - - - - - - - - - - - - - - - - -

route[0]
{
       if($si=='10.10.10.10')
       {
               # Allowed Host
               route(1);
       }
       else
       {
               sl_send_reply("603", "Decline");
               exit;
       }
}

# - - - - - - - - - - - - - - - - - - - -

route[1]
{
       if(msg:len > 2048)
       {
               sl_send_reply("513", "Message Too Big");
               exit;
       }

       if (!mf_process_maxfwd_header("10"))
       {
               sl_send_reply("483", "Too Many Hops");
               exit;
       }

       if (method==OPTIONS) {
               if ((uri==myself) && (! uri=~"sip:.*[@]+.*")) {
                       options_reply();
                       exit;
               }
       }

       if (!method=="REGISTER")
       {
               record_route();
       }

       if (loose_route())
       {
               append_hf("P-hint: rr-enforced\r\n");
       }

       if (is_method("CANCEL"))
       {
               if (t_check_trans())
               {
                       t_relay();
               }
               exit;
       }

       route(2);
}

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route[2]
{
       xlog("L_INFO", "Attempting Carrier 1");
       t_on_failure("3");
       t_relay("udp:1.1.1.1:5090","0x2");
       exit;
}

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failure_route[3]
{
       xlog("L_INFO", "Attempting Carrier 2");
       t_on_failure("4");
       t_relay("udp:2.2.2.2:5060");
       exit;
}

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failure_route[4]
{
       # I would like to know how to redirect the
       # original call destined to extension "100"
       # to 2015551234, but the originating server
       # will get nervous if the username@ part
       # of its SIP request is changed. How could
}

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Any further suggestions would be appreciated. Thanks!