Problem with Kamailio not routing ACK to a 200 OK - sr-users

28 Oct 2010


      Hi,
I have a strange problem with Kamailio 3.0.2. When one of our end
users makes a call Kamailio does not route the ACK (in response to the
200 OK). For all other end users it works fine.
For me it looks the the has_totag() checks for some reason fails and
then t_check_trans() thinks it is a ACK to a local transactions and
then terminates the script. Otherwise there should be more lines in
the log file.
The conf is pretty standard.
route{
xlog("L_WARN", "New request - M=$rm RURI=$ru F=$fu T=$tu
IP=$si ID=$ci\n");
        xlog("L_WARN", "ua=$ua");
        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                exit;
        }
if(!sanity_check("1511", "7"))
        {
                xlog("Malformed SIP message from $si:$sp\n");
                exit;
        }
if (has_totag()) {
                xlog("L_WARN", "has_totag start - M=$rm RURI=$ru F=$fu
T=$tu IP=$si ID=$ci\n");
                # sequential request withing a dialog should
                # take the path determined by record-routing
                if (loose_route()) {
                        xlog("L_WARN", "loose_route - M=$rm RURI=$ru
F=$fu T=$tu IP=$si ID=$ci\n");
                        route(RELAY);
                } else {
                        if (is_method("SUBSCRIBE") && uri == myself) {
                                # in-dialog subscribe requests
                                #route(PRESENCE);
                                exit;
                        }
                        if ( is_method("ACK") ) {
                                if ( t_check_trans() ) {
                                        xlog("L_WARN", "ACK
t_check_trans - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
                                        # non loose-route, but
stateful ACK; must be an ACK after a 487 or e.g. 404 from upstream
server
                                        t_relay();
                                        exit;
                                } else {
                                        xlog("Ignoring ACK - M=$rm
RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
                                        # ACK without matching
transaction ... ignore and discard.\n");
                                        exit;
                                }
                        }
                        sl_send_reply("404","Not here");
                }
                xlog("L_WARN", "has_totag end - M=$rm RURI=$ru F=$fu
T=$tu IP=$si ID=$ci\n");
                exit;
        }
#initial requests
# CANCEL processing
        if (is_method("CANCEL"))
        {
                if (t_check_trans())
                        t_relay();
                exit;
        }
setflag(4);
        t_check_trans();
...
The log files show:
Oct 28 10:51:13 sip-core-1 /usr/local/sbin/kamailio[10503]: WARNING:
<script>: New request - M=ACK RURI=sip:1105@178.21.248.56:5060
F=sip:87776688@sip.uni-tel.dk T=sip:869
87106@sip.uni-tel.dk IP=178.21.248.20 ID=AI231CA9BD0A4A1C53@10.0.0.150
Oct 28 10:51:13 sip-core-1 /usr/local/sbin/kamailio[10503]: WARNING:
<script>: ua=Aastra Intelligate
The trace
U 2010/10/28 10:51:02.616337 178.21.248.7:5060 -> 178.21.248.56:5060
INVITE sip:86987106@178.21.248.56 SIP/2.0.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02.
Record-Route: sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
To: sip:86987106@sip.uni-tel.dk.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Max-Forwards: 68.
Contact: sip:87776688@87.104.233.108:5060;line=AI7EFC34995E724DD7.
Accept: application/sdp.
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER.
P-Preferred-Identity: sip:87776688@sip.uni-tel.dk.
Privacy: none.
User-Agent: Aastra Intelligate.
Content-Type: application/sdp.
Content-Length: 280.
X-trunktype: IC.
.
v=0.
o=intelligate 1194032777 1194032777 IN IP4 87.104.233.106.
s=call.
c=IN IP4 178.21.248.22.
t=0 0.
m=audio 60984 RTP/AVP 8 0 18 101.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:18 G729/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=sendrecv.
a=ptime:20.
#
U 2010/10/28 10:51:02.636854 178.21.248.56:5060 -> 178.21.248.7:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Length: 0.
.
#####
U 2010/10/28 10:51:04.134445 178.21.248.56:5060 -> 178.21.248.7:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
#
U 2010/10/28 10:51:04.134748 178.21.248.7:5060 -> 178.21.248.20:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
#
U 2010/10/28 10:51:04.136586 178.21.248.56:5060 -> 178.21.248.7:5060
SIP/2.0 180 Ringing.
Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
#
U 2010/10/28 10:51:04.136837 178.21.248.7:5060 -> 178.21.248.20:5060
SIP/2.0 180 Ringing.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
##############################
U 2010/10/28 10:51:12.881179 178.21.248.56:5060 -> 178.21.248.7:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 178.21.248.7;branch=z9hG4bK690c.9cfea506.0.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
#
U 2010/10/28 10:51:12.882388 178.21.248.7:5060 -> 178.21.248.20:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.0.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK3c70fae55c8b362ff34e6c782cc21592.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 INVITE.
Contact: sip:1105@178.21.248.56:5060.
Record-Route: sip:178.21.248.7;lr;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02,sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Supported: em,timer,replaces,path,early-session,resource-priority.
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE.
Server: Audiocodes-Sip-Gateway-Mediant 2000/v.5.60A.035.002.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=AudiocodesGW 2073965634 2073965290 IN IP4 178.21.248.56.
s=Phone-Call.
c=IN IP4 178.21.248.56.
t=0 0.
m=audio 6050 RTP/AVP 8 101.
c=IN IP4 178.21.248.56.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
##### <<<<<<<<<<<<<<<<<<<<<<  This is the problem packet >>>>>>>>>>>>>>>>>>>>>
U 2010/10/28 10:51:13.267863 178.21.248.20:5060 -> 178.21.248.7:5060
ACK sip:1105@178.21.248.56:5060 SIP/2.0.
Record-Route: sip:178.21.248.20;lr;ftag=AI8DA85D59B9B6634F.
Via: SIP/2.0/UDP 178.21.248.20;branch=z9hG4bK690c.97354e4.2.
Via: SIP/2.0/UDP
87.104.233.108:5060;rport=5060;branch=z9hG4bK07103fe69c8af048b9b8216eb2f7233f.
To: sip:86987106@sip.uni-tel.dk;tag=1c2073920452.
From: sip:87776688@sip.uni-tel.dk;tag=AI8DA85D59B9B6634F.
Call-ID: AI231CA9BD0A4A1C53@10.0.0.150.
CSeq: 2 ACK.
Max-Forwards: 69.
Route: sip:178.21.248.7;lr=on;ftag=AI8DA85D59B9B6634F;did=f48.5fd1db02.
User-Agent: Aastra Intelligate.
Content-Length: 0.
-- 
Morten Isaksen