24 Feb
2003
24 Feb
'03
9:22 a.m.
I've got a packet that looks like:
#
U 2003/02/24 07:56:52.503535 216.87.144.203:5060 -> 216.87.145.22:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 216.87.145.22:5060;branch=z9hG4bK-ng5tokyx448r.
From: "snom man" <sip:4695461245@augustvoice.net>;tag=8u6ju8wxuc.
To: <sip:2143357976@augustvoice.net;user=phone>;tag=3CBB0360-532.
Date: Mon, 24 Feb 2003 13:56:43 GMT.
Call-ID: 3c267202b6a8-lgseu8olovlp(a)216.87.145.22.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 2 INVITE.
Session-Expires: 7200;refresher=uac.
Require: timer.
Allow-Events: telephone-event.
Contact: <sip:92143357976@216.87.144.196:5060;user=phone>.
Record-Route: <sip:2143357976@216.87.144.203;ftag=8u6ju8wxuc;lr>.
Content-Type: application/sdp.
Content-Length: 209.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 7543 5694 IN IP4 216.87.144.196.
s=SIP Call.
c=IN IP4 216.87.144.196.
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 216.87.144.196, 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 216.87.144.203
should be responded to, which is my PROXY.
Also in the packet above, there is a 'Contact:' line that indicates
the GATEWAY at 216.87.144.196 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?
24 Feb
24 Feb
10:25 a.m.
I plead Snom guilty. The phones should see a loose router ahead of
them and behave as in example in Section 16.12.1.1 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).
-Jiri
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 216.87.144.203:5060 -> 216.87.145.22:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 216.87.145.22:5060;branch=z9hG4bK-ng5tokyx448r.
From: "snom man" <sip:4695461245@augustvoice.net>;tag=8u6ju8wxuc.
To: <sip:2143357976@augustvoice.net;user=phone>;tag=3CBB0360-532.
Date: Mon, 24 Feb 2003 13:56:43 GMT.
Call-ID: 3c267202b6a8-lgseu8olovlp(a)216.87.145.22.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 2 INVITE.
Session-Expires: 7200;refresher=uac.
Require: timer.
Allow-Events: telephone-event.
Contact: <sip:92143357976@216.87.144.196:5060;user=phone>.
Record-Route: <sip:2143357976@216.87.144.203;ftag=8u6ju8wxuc;lr>.
Content-Type: application/sdp.
Content-Length: 209.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 7543 5694 IN IP4 216.87.144.196.
s=SIP Call.
c=IN IP4 216.87.144.196.
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 216.87.144.196, 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 216.87.144.203
should be responded to, which is my PROXY.
Also in the packet above, there is a 'Contact:' line that indicates
the GATEWAY at 216.87.144.196 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?
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Jiri Kuthan http://iptel.org/~jiri/
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participants (2)
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Greg Fausak -
Jiri Kuthan