[Serusers] Record-route:/Contact: conflict?

Jiri Kuthan jiri at iptel.org
Mon Feb 24 16:25:23 CET 2003

I plead Snom guilty. The phones should see a loose router ahead of
them and behave as in example in Section in RFC 3261:
put callee's contact in r-uri of subsequent requests, and send it
to the address in loose route. (SER should be then configured to
delete the loose route and forward to the destination in r-uri).


At 03:22 PM 2/24/2003, Greg Fausak wrote:
>I've got a packet that looks like:
>U 2003/02/24 07:56:52.503535 ->
>SIP/2.0 200 OK.
>Via: SIP/2.0/UDP;branch=z9hG4bK-ng5tokyx448r.
>From: "snom man" <sip:4695461245 at augustvoice.net>;tag=8u6ju8wxuc.
>To: <sip:2143357976 at augustvoice.net;user=phone>;tag=3CBB0360-532.
>Date: Mon, 24 Feb 2003 13:56:43 GMT.
>Call-ID: 3c267202b6a8-lgseu8olovlp at
>Server: Cisco-SIPGateway/IOS-12.x.
>CSeq: 2 INVITE.
>Session-Expires: 7200;refresher=uac.
>Require: timer.
>Allow-Events: telephone-event.
>Contact: <sip:92143357976 at;user=phone>.
>Record-Route: <sip:2143357976 at;ftag=8u6ju8wxuc;lr>.
>Content-Type: application/sdp.
>Content-Length: 209.
>o=CiscoSystemsSIP-GW-UserAgent 7543 5694 IN IP4
>s=SIP Call.
>c=IN IP4
>t=0 0.
>m=audio 16632 RTP/AVP 0 100.
>a=rtpmap:0 PCMU/8000.
>a=rtpmap:100 X-NSE/8000.
>a=fmtp:100 192-194.
>The main thing to note is the packet is sent to a SNOM phone from
> my PROXY server.  Curious, when the SNOM phone responds it is
> responding to, which is my GATEWAY.  My GATEWAY is
> configured to only listen to the PROXY server, so it drops the packet.
>In the packet above, the Record-route line indicates that
> should be responded to, which is my PROXY.
>Also in the packet above, there is a 'Contact:' line that indicates
> the GATEWAY at should be contacted.
>Obviously the SNOM phone is getting the address from the Contact:
> line (or maybe the SDP) rather than the Record-route: line.
>Is it doing so incorrectly, or do I have a bug in my GATEWAY, or
> does the PROXY need to strip out the Contact: line?
>Serusers mailing list
>serusers at lists.iptel.org

Jiri Kuthan            http://iptel.org/~jiri/ 

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