Kamailio modifying ruri during loose-route - sr-users

26 Mar 2012

Hey Guys,

I have noticed some unexpected behavior (at least by me) during my tests.

When routing specific ACK message back to 200 OK originator, Kamailio
will rewrite the ruri with the value of route header. Is that known or
some memory access problem?

Call setup: B2BUA(127.0.0.1) -> Kamailio (1.2.3.4) -> End device (2.3.4.5).

Bellow is a trace of 200 OK -ACK flow before and after kamailio,
together with the xlog capture of ruri before and after calling
loose_route on ACK.

Thanks in advance for any kind of tip.

DanB

PS: Since testing with a newer version would be a bit harder due to
some particular features I use in 3.1 which are taking a bit of effort
to migrate, have tried my luck here before, so hope to get your
understanding.

Kamailio version:
"""

root@kam:/home/dan# kamailio -V
version: kamailio 3.1.5 (x86_64/linux)
flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS,
USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM,
SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC, USE_FUTEX,
FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
MAX_URI_SIZE 1024, BUF_SIZE 65535, PKG_SIZE 4MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled on 07:41:01 Sep 15 2011 with gcc 4.4.5
"""

Syslog:
"""

Mar 26 14:27:01 kam /usr/sbin/kamailio[7929]: ERROR: <script>: Before
loose_route, ru is sip:01234567@127.0.0.1:5069;transport=udp
Mar 26 14:27:01 kam /usr/sbin/kamailio[7929]: ERROR: <script>: Loose
route, ru is sip:1.2.3.4:25060;lr=on;ftag=a9c837bc;nat=yes
"""

Ngrep of call:
"""
#
U 2012/03/26 14:27:00.089455 127.0.0.1:5069 -> 1.2.3.4:25060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.4:25060;branch=z9hG4bK361e.ba530345.0.
Via: SIP/2.0/UDP
192.168.1.29:5060;rport=3081;received=2.3.4.5;branch=z9hG4bK-373632-e2d6ebcc5a1d2a481e4957541b393f9a.
Record-Route: <sip:1.2.3.4:25060;lr=on;ftag=a9c837bc;nat=yes>.
From: "ines.demo" <sip:ines.demo@mydomain.net>;tag=a9c837bc.
To: <sip:01234567@mydomain.net>;tag=BcBSHa56Bp7ge.
Call-ID: 65464bffda1b33cfcc9d97c9e8f81cb3@0:0:0:0:0:0:0:0.
CSeq: 2 INVITE.
Contact: <sip:01234567@127.0.0.1:5069;transport=udp>.
User-Agent: WebiB2BUA 1.0.6.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY.
Supported: timer, precondition, path, replaces.
Allow-Events: talk, hold, refer.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 417.
Remote-Party-ID: "01234567"
<sip:01234567@mydomain.net>;party=calling;privacy=off;screen=no.
.
v=0.
o=root 13076 13076 IN IP4 1.2.3.4.
s=session.
c=IN IP4 1.2.3.4.
t=0 0.
m=audio 48548 RTP/AVP 8 0 102 3 101.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:102 iLBC/8000.
a=fmtp:102 mode=30.
a=rtpmap:3 GSM/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.
a=nortpproxy:yes.
m=video 0 RTP/AVP 96 97 98.
a=rtpmap:96 /0.
a=rtpmap:97 /0.
a=rtpmap:98 /0.

#
U 2012/03/26 14:27:00.089589 1.2.3.4:25060 -> 2.3.4.5:3081
SIP/2.0 200 OK.
Via: SIP/2.0/UDP
192.168.1.29:5060;rport=3081;received=2.3.4.5;branch=z9hG4bK-373632-e2d6ebcc5a1d2a481e4957541b393f9a.
Record-Route: <sip:1.2.3.4:25060;lr=on;ftag=a9c837bc;nat=yes>.
From: "ines.demo" <sip:ines.demo@mydomain.net>;tag=a9c837bc.
To: <sip:01234567@mydomain.net>;tag=BcBSHa56Bp7ge.
Call-ID: 65464bffda1b33cfcc9d97c9e8f81cb3@0:0:0:0:0:0:0:0.
CSeq: 2 INVITE.
Contact: <sip:01234567@127.0.0.1:5069;transport=udp>.
User-Agent: WebiB2BUA 1.0.6.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY.
Supported: timer, precondition, path, replaces.
Allow-Events: talk, hold, refer.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 417.
Remote-Party-ID: "01234567"
<sip:01234567@mydomain.net>;party=calling;privacy=off;screen=no.
.
v=0.
o=root 13076 13076 IN IP4 1.2.3.4.
s=session.
c=IN IP4 1.2.3.4.
t=0 0.
m=audio 48548 RTP/AVP 8 0 102 3 101.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:102 iLBC/8000.
a=fmtp:102 mode=30.
a=rtpmap:3 GSM/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.
a=nortpproxy:yes.
m=video 0 RTP/AVP 96 97 98.
a=rtpmap:96 /0.
a=rtpmap:97 /0.
a=rtpmap:98 /0.

#
U 2012/03/26 14:27:00.160046 2.3.4.5:3081 -> 1.2.3.4:25060
ACK sip:01234567@127.0.0.1:5069;transport=udp SIP/2.0.
Call-ID: 65464bffda1b33cfcc9d97c9e8f81cb3@0:0:0:0:0:0:0:0.
CSeq: 2 ACK.
Via: SIP/2.0/UDP
192.168.1.29:5060;branch=z9hG4bK-373632-6eac5ecf0ba5ab4ce7094ad17870dca3.
From: "ines.demo" <sip:ines.demo@mydomain.net>;tag=a9c837bc.
To: <sip:01234567@mydomain.net>;tag=BcBSHa56Bp7ge.
Max-Forwards: 70.
Route: <sip:1.2.3.4:25060;lr=on;ftag=a9c837bc;nat=yes>.
Contact: "ines.demo"
<sip:ines.demo@192.168.1.29:5060;transport=udp;registering_acc=mydomain_net>.
User-Agent: Jitsi1.0-beta1-nightly.build.3820Windows 7.
Content-Length: 0.
.

#
U 2012/03/26 14:27:00.160278 1.2.3.4:25060 -> 1.2.3.4:25060
ACK sip:1.2.3.4:25060;lr=on;ftag=a9c837bc;nat=yes SIP/2.0.
Call-ID: 65464bffda1b33cfcc9d97c9e8f81cb3@0:0:0:0:0:0:0:0.
CSeq: 2 ACK.
Via: SIP/2.0/UDP 1.2.3.4:25060;branch=z9hG4bKcydzigwkX.
Via: SIP/2.0/UDP
192.168.1.29:5060;rport=3081;received=2.3.4.5;branch=z9hG4bK-373632-6eac5ecf0ba5ab4ce7094ad17870dca3.
From: "ines.demo" <sip:ines.demo@mydomain.net>;tag=a9c837bc.
To: <sip:01234567@mydomain.net>;tag=BcBSHa56Bp7ge.
Max-Forwards: 69.
Contact: "ines.demo"
<sip:ines.demo@2.3.4.5:3081;transport=udp;registering_acc=mydomain_net>.
User-Agent: Jitsi1.0-beta1-nightly.build.3820Windows 7.
Content-Length: 0.
"""