[OpenSIPS-Users] OpenSIPs mhomed + rtpproxy + nated UAC = problem with SDP

Thu Apr 4 18:24:45 CEST 2013

Hello,

For my first post on this mailing list, I'm trying to make opensips 
working in this scheme (that's a lab test, so don't take care of my 
"public" ip addresses) :

UAC (asterisk) <---------------------> routeur(*nat*) 
<------------------> opensips (mhomed) <----------> sip privoder
10.10.1.1                               10.10.1.254 / 10.7.59.1         
           10.7.59.2 / 10.0.95.10      10.0.95.1

mhomed is set to 1
I have a rtpproxy set in bridge mode on my opensips, like this :
//usr/local/bin/rtpproxy -p /var/run/rtpproxy.pid -u rtpproxy -d DBUG 
LOG_LOCAL5 -m 10000 -M 20000 -l 10.0.95.10 10.7.59.2 -s udp:127.0.0.1 9999/

I'm trying to establish a call from my asterisk to a public phone 
number, but I have a problem with SDP reply (200 OK) , from my opensips 
to my UAC.
SDP c= value is still 10.0.95.10, instead of 10.7.59.2. That's the only 
thing that is not correct in the SIP session. I can't find why c= value 
is not correct in the 200 OK.

I use engage_rtp_proxy("fr"), but I tried with many combinations 
(rtpproxy_offer / answer, params=fier, params=feir).

If somebody has already been in this situation, I would appreciate his help.
Thanks for your replies, please tell me if you need more captures or 
anything else

Here's a short description of SIP requests, seen from OpenSIPS :

_*##### INVITE FROM MY UAC TO OPENSIPS ###############*_
U 2013/04/04 18:18:09.621724 10.7.59.1:1028 -> 10.7.59.2:5060
INVITE sip:0604596002 at 10.7.59.2 SIP/2.0
Via: SIP/2.0/UDP 10.7.59.1:1029;branch=z9hG4bK13253a27;rport
Max-Forwards: 70
From: "100" <sip:0970559990 at 10.7.59.1:1029>;tag=as747d5e5b
To: <sip:0604596002 at 10.7.59.2>
Contact: <sip:0970559990 at 10.7.59.1:1029>
Call-ID: 211f651b7793be045c9c25880e1df4ac at 10.10.1.1:5060
CSeq: 102 INVITE
User-Agent: Oceanet-test
Date: Thu, 04 Apr 2013 16:12:34 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH
Supported: replaces
Content-Type: application/sdp
Content-Length: 282

v=0
o=root 1416933599 1416933599 IN IP4 10.10.1.1
s=Asterisk PBX 1.8.20.1
c=IN IP4 10.7.59.1
t=0 0
m=audio 17282 RTP/AVP 9 0 101
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

_*#####*__*INVITE FROM OPENSIPS TO PROVIDER *__*###############*_
U 2013/04/04 18:18:09.622378 10.0.95.10:5060 -> 10.0.95.1:5060
INVITE sip:0604596002 at 10.0.95.1 SIP/2.0
Via: SIP/2.0/UDP 10.0.95.10;branch=z9hG4bKbd97.ced0f0b2.0
Max-Forwards: 69
From: "100" <sip:0970559990 at 10.7.59.1:1029>;tag=as747d5e5b
To: <sip:0604596002 at 10.7.59.2>
Contact: <sip:10.0.95.10;did=b0b.7e82f333>
Call-ID: 211f651b7793be045c9c25880e1df4ac at 10.10.1.1:5060
CSeq: 102 INVITE
User-Agent: Oceanet-test
Date: Thu, 04 Apr 2013 16:12:34 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH
Supported: replaces
Content-Type: application/sdp
Content-Length: 283

v=0
o=root 1416933599 1416933599 IN IP4 10.10.1.1
s=Asterisk PBX 1.8.20.1
c=IN IP4 10.0.95.10
t=0 0
m=audio 19392 RTP/AVP 9 0 101
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

*_##### REPLY FROM PROVIDER TO OPENSIPS ###############_*
U 2013/04/04 18:18:16.327567 10.0.95.1:5060 -> 10.0.95.10:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.0.95.10;branch=z9hG4bKbd97.ced0f0b2.0
Call-ID: 211f651b7793be045c9c25880e1df4ac at 10.10.1.1:5060
From: "100" <sip:0970559990 at 10.7.59.1:1029>;tag=as747d5e5b
To: <sip:0604596002 at 10.7.59.2>;tag=a94c095b773be1dd6e8d668a785a9c84530b7132
Contact: <sip:10.0.95.1;did=b0b.c3c431b5>
CSeq: 102 INVITE
Server: Dialogic-SIP/10.5.3.360 ACKBAR 0
Allow: INVITE, BYE, REGISTER, ACK, OPTIONS, CANCEL, SUBSCRIBE, NOTIFY, 
INFO, REFER, UPDATE
Supported: path, replaces, timer, tdialog
Accept: application/sdp, application/dtmf-relay, text/plain
Content-Type: application/sdp
Content-Length: 238

v=0
o=Dialogic_SDP 2521466 0 IN IP4 91.213.145.116
s=Dialogic-SIP
c=IN IP4 10.0.95.3
t=0 0
m=audio 10018 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=silenceSupp:off - - - -
a=ptime:20

_*#### REPLY FROM OPENSIPS TO UAC WITH WRONG SDP ################*_
U 2013/04/04 18:18:16.328296 10.7.59.2:5060 -> 10.7.59.1:1028
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.7.59.1:1029;branch=z9hG4bK13253a27;rport
Call-ID: 211f651b7793be045c9c25880e1df4ac at 10.10.1.1:5060
From: "100" <sip:0970559990 at 10.7.59.1:1029>;tag=as747d5e5b
To: <sip:0604596002 at 10.7.59.2>;tag=a94c095b773be1dd6e8d668a785a9c84530b7132
Contact: <sip:10.7.59.2;did=b0b.7e82f333>
CSeq: 102 INVITE
Server: Dialogic-SIP/10.5.3.360 ACKBAR 0
Allow: INVITE, BYE, REGISTER, ACK, OPTIONS, CANCEL, SUBSCRIBE, NOTIFY, 
INFO, REFER, UPDATE
Supported: path, replaces, timer, tdialog
Accept: application/sdp, application/dtmf-relay, text/plain
Content-Type: application/sdp
Content-Length: 239

v=0
o=Dialogic_SDP 2521466 0 IN IP4 91.213.145.116
s=Dialogic-SIP
_*c=IN IP4 10.0.95.10*_
t=0 0
m=audio 11526 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=silenceSupp:off - - - -
a=ptime:20

Cédric
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