Oct  7 15:05:12 lab-linux01 kamailio: DBG:uri:has_totag: totag found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:pv_get_dsturi: no destination URI
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:parse_headers: flags=200
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:get_hdr_field: content_length=0
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:get_hdr_field: found end of header
Oct  7 15:05:12 lab-linux01 kamailio: DBG:rr:find_first_route: No Route headers found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:rr:loose_route: There is no Route HF
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:parse_headers: flags=78
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:t_lookup_request: start searching: hash=14964, isACK=1
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:matching_3261: RFC3261 transaction matching failed
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:t_lookup_request: no transaction found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:destroy_avp_list: destroying list (nil)

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From: alex_rsm@hotmail.com
To: users@lists.kamailio.org
Date: Tue, 7 Oct 2008 14:31:28 -0400
Subject: [Kamailio-Users] ACK without matching transaction discarded

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@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@10.0.0.174:5040>;tag=1
To: <sip:9134750000@10.0.0.183:5080>;tag=1
Call-ID: 1-12255@10.0.0.174
CSeq: 1 ACK
Contact: sip:sipp@10.0.0.174:5040
Max-Forwards: 70
Subject: Performance Test
Content-Length: 0

and here is the debug log:

Oct  7 15:05:12 lab-linux01 kamailio: DBG:uri:has_totag: totag found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:pv_get_dsturi: no destination URI
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:parse_headers: flags=200
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:get_hdr_field: content_length=0
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:get_hdr_field: found end of header
Oct  7 15:05:12 lab-linux01 kamailio: DBG:rr:find_first_route: No Route headers found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:rr:loose_route: There is no Route HF
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:parse_headers: flags=78
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:t_lookup_request: start searching: hash=14964, isACK=1
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:matching_3261: RFC3261 transaction matching failed
Oct  7 15:05:12 lab-linux01 kamailio: DBG:tm:t_lookup_request: no transaction found
Oct  7 15:05:12 lab-linux01 kamailio: DBG:core:destroy_avp_list: destroying list (nil)


Am I missing anything?

Thanks,
Alex

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