[OpenSER-Users] Loop Detection

[Alex Balashov]

And probably a new call-ID as well.  In other words, you'd probably need 
all the logical elements of a distinct call leg, per the RFC;  the source 
of application you'd want to use a back-to-back user agent for if you
weren't using OpenSER.


On Mon, 10 Dec 2007, Daniel Corbe wrote:

> I have a problem.  I'm taking INVITES from a PortaSIP proxy and handing it
> back with a new request URI and To: header; however, their loop
> detection algorithm is calling this a loop.
> Is there a way to fix this from within OpenSER?  I'm assuming my proxy would
> have to send an INVITE with a completely new branch tag and From tag?
>
> 10 Dec 14:52:30.831/GLOBAL/b2bua: SENDING message to 206.71.169.114:5060:
> INVITE sip:*94310 at 206.71.169.114:5060 SIP/2.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport
> Max-Forwards: 70
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:*94310 at 206.71.169.114>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Contact: Anonymous <sip:216.151.143.69:5061>
> Expires: 300
> User-Agent: Sippy
> cisco-GUID: 2108088383-2809270748-2290810900-572575638
> h323-conf-id: 2108088383-2809270748-2290810900-572575638
> Content-Length: 201
> Content-Type: application/sdp
> v=0
> o=Sippy 156402124 0 IN IP4 216.151.143.69
> s=sip call
> t=0 0
> m=audio 42486 RTP/AVP 18 0 8
> c=IN IP4 216.151.143.77
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:18 G729/8000
> a=sendrecv
>
> 10 Dec 14:52:30.841/GLOBAL/b2bua: RECEIVED message from 206.71.169.114:5060:
> SIP/2.0 100 Giving a try
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:*94310 at 206.71.169.114>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Server: OpenSER (1.2.2-notls (i386/freebsd))
> Content-Length: 0
>
> 10 Dec 14:52:30.842/GLOBAL/ser[69804]: RECEIVED message from
> 206.71.169.114:5060:
> INVITE sip:1a10000000009 at 216.151.143.69:5060 SIP/2.0
> Record-Route: <sip:206.71.169.114
> ;lr=on;ftag=3b383c39c2bc93d8106f4425074ef399;did=fad.a2f4eb52>
> Via: SIP/2.0/UDP 206.71.169.114;branch=z9hG4bK961c.41ea57a.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> Max-Forwards: 69
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:1a10000000009 at 216.151.143.69:5060>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Contact: Anonymous <sip:216.151.143.69:5061>
> Expires: 300
> User-Agent: Sippy
> cisco-GUID: 2108088383-2809270748-2290810900-572575638
> h323-conf-id: 2108088383-2809270748-2290810900-572575638
> Content-Length: 201
> Content-Type: application/sdp
> P-hint: rr-enforced
> v=0
> o=Sippy 156402124 0 IN IP4 216.151.143.69
> s=sip call
> t=0 0
> m=audio 42486 RTP/AVP 18 0 8
> c=IN IP4 216.151.143.77
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:18 G729/8000
> a=sendrecv
>
> 10 Dec 14:52:30.842/722814-3406315950-714741 at msx69.mydomain.com~1o/ser[69804]:
> processing INVITE received from 206.71.169.114
> 10 Dec 14:52:30.843/GLOBAL/ser[69804]: SENDING message to
> 206.71.169.114:5060:
> SIP/2.0 100 trying -- your call is important to us
> Via: SIP/2.0/UDP 206.71.169.114;branch=z9hG4bK961c.41ea57a.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:1a10000000009 at 216.151.143.69:5060>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Server: Sip EXpress router (0.9.6 (i386/freebsd))
> Content-Length: 0
>
> 10 Dec 14:52:30.844/GLOBAL/ser[69804]: SENDING message to
> 216.151.143.69:5061:
> INVITE sip:1a10000000009 at 216.151.143.69:5061 SIP/2.0
> Record-Route: <sip:216.151.143.69;ftag=3b383c39c2bc93d8106f4425074ef399;lr>
> Record-Route: <sip:206.71.169.114
> ;lr=on;ftag=3b383c39c2bc93d8106f4425074ef399;did=fad.a2f4eb52>
> Via: SIP/2.0/UDP 216.151.143.69;branch=
> z9hG4bK961c.003d31266db19cfeb34aa550d186a976.0
> Via: SIP/2.0/UDP 206.71.169.114;branch=z9hG4bK961c.41ea57a.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> Max-Forwards: 16
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:1a10000000009 at 216.151.143.69:5060>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Contact: Anonymous <sip:216.151.143.69:5061>
> Expires: 300
> User-Agent: Sippy
> cisco-GUID: 2108088383-2809270748-2290810900-572575638
> Content-Length: 201
> Content-Type: application/sdp
> P-hint: rr-enforced
> v=0
> o=Sippy 156402124 0 IN IP4 216.151.143.69
> s=sip call
> t=0 0
> m=audio 42486 RTP/AVP 18 0 8
> c=IN IP4 216.151.143.77
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:18 G729/8000
> a=sendrecv
>
> 10 Dec 14:52:30.844/GLOBAL/b2bua: RECEIVED message from 216.151.143.69:5060:
> INVITE sip:1a10000000009 at 216.151.143.69:5061 SIP/2.0
> Record-Route: <sip:216.151.143.69;ftag=3b383c39c2bc93d8106f4425074ef399;lr>
> Record-Route: <sip:206.71.169.114
> ;lr=on;ftag=3b383c39c2bc93d8106f4425074ef399;did=fad.a2f4eb52>
> Via: SIP/2.0/UDP 216.151.143.69;branch=
> z9hG4bK961c.003d31266db19cfeb34aa550d186a976.0
> Via: SIP/2.0/UDP 206.71.169.114;branch=z9hG4bK961c.41ea57a.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> Max-Forwards: 16
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:1a10000000009 at 216.151.143.69:5060>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Contact: Anonymous <sip:216.151.143.69:5061>
> Expires: 300
> User-Agent: Sippy
> cisco-GUID: 2108088383-2809270748-2290810900-572575638
> Content-Length: 201
> Content-Type: application/sdp
> P-hint: rr-enforced
> v=0
> o=Sippy 156402124 0 IN IP4 216.151.143.69
> s=sip call
> t=0 0
> m=audio 42486 RTP/AVP 18 0 8
> c=IN IP4 216.151.143.77
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:18 G729/8000
> a=sendrecv
>
> 10 Dec 14:52:30.847/GLOBAL/b2bua: SENDING message to 216.151.143.69:5060:
> SIP/2.0 482 Loop Detected
> Via: SIP/2.0/UDP 216.151.143.69;branch=
> z9hG4bK961c.003d31266db19cfeb34aa550d186a976.0
> Via: SIP/2.0/UDP 206.71.169.114;branch=z9hG4bK961c.41ea57a.0
> Via: SIP/2.0/UDP 216.151.143.69:5061
> ;branch=z9hG4bKecaee2770d3db1e3a26ddc741511b55b;rport=5061
> Record-Route: <sip:216.151.143.69;ftag=3b383c39c2bc93d8106f4425074ef399;lr>
> Record-Route: <sip:206.71.169.114
> ;lr=on;ftag=3b383c39c2bc93d8106f4425074ef399;did=fad.a2f4eb52>
> From: <sip:18589520696 at 216.151.143.69>;tag=3b383c39c2bc93d8106f4425074ef399
> To: <sip:1a10000000009 at 216.151.143.69:5060>
> Call-ID: 722814-3406315950-714741 at msx69.mydomain.com~1o
> CSeq: 200 INVITE
> Server: Sippy
>

--
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : +1-678-954-0670
Direct : +1-678-954-0671