[Kamailio-Users] ACK without matching transaction discarded

[Alex R.S.M]

Hi,

I am using openSER as a proxy for a simple SIP call (UAC <--> openSER <--> UAS).  openSER receives ACK from callee but doesn't send it to caller.
It seems openSER can not find a matching transaction, so it ignore and discard the message.

         if ( is_method("ACK") )
         {
            if ( t_check_trans() )
            {
               t_relay();
               exit;
            }
            else
            {
              # ACK without matching transaction ... ignore and discard.\n");               exit;
            }

Here is the message header:

Internet Protocol, Src: 10.0.0.174 (10.0.0.174), Dst: 10.0.0.160 (10.0.0.160)
...
ACK sip:9134750000 at 10.0.0.183:5080 SIP/2.0
Via: SIP/2.0/UDP 10.0.0.174:5040;branch=z9hG4bK-12255-1-4
From: <sip:9133750000 at 10.0.0.174:5040>;tag=1
To: <sip:9134750000 at 10.0.0.183:5080>;tag=1
Call-ID: 1-12255 at 10.0.0.174
CSeq: 1 ACK
Contact: sip:sipp at 10.0.0.174:5040
Max-Forwards: 70
Subject: Performance Test
Content-Length: 0


Am I missing anything?

Thanks,
Alex


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