[Serusers] Re: [Serdev] UA request responses that do not conform RFC3261 nor RFC2543

[Jan Janak]

The best way would be to fix the user agent. SER would not know where to
forward the reply if it does not contain Via.

   Jan.

On 02-06-2005 10:58, Dominik Schulte wrote:
> Hi,
> 
> I am struggling with a problem where I have a UA that responds to invites but 
> does not preserve the original request Via fields. see ngrep capture below.
> I can see that SER receives the reply, but drops it because it cannot correlate any transaction with this response.
> I tried to write a module that uses the tm modules callbacks, but it seems that response messages are dropped by the core.
> 
> Is there any way I can validate responses that fall outside any transaction??
> 
> 	#
> 	U 172.17.26.19:5060 -> 172.17.26.178:5060
> 	INVITE sip:dschulte at heat.callsuite.tellumat.co.za SIP/2.0.
> 	Via: SIP/2.0/UDP 172.17.26.19:5060;rport;branch=z9hG4bKE2FD4189B717447BB8192445A851777B.
> 	From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: <sip:dschulte at heat.callsuite.tellumat.co.za>.
> 	Contact: <sip:1200 at 172.17.26.19:5060>.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Max-Forwards: 70.
> 	Content-Type: application/sdp.
> 	User-Agent: X-Lite release 1103m.
> 	Content-Length: 293.
> 
> 
> 	#
> 	U 172.17.26.178:5060 -> 172.17.26.19:5060
> 	SIP/2.0 100 trying -- your call is important to us.
> 	Via: SIP/2.0/UDP 172.17.26.19:5060;rport=5060;branch=z9hG4bKE2FD4189B717447BB8192445A851777B.
> 	From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: <sip:dschulte at heat.callsuite.tellumat.co.za>.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Server: Sip EXpress router (0.8.14 (i386/linux)).
> 	Content-Length: 0.
> 	Warning: 392 172.17.26.178:5060 "Noisy feedback tells:  pid=17762 req_src_ip=172.17.26.19 req_src_port=5060 in_uri=sip:dschulte at heat.callsuite.tellumat.co.za out_uri=sip:94099:1001 at 172.17.1.31 via_cnt==1".
> 	.
> 
> 	#
> 	U 172.17.26.178:5060 -> 172.17.1.31:5060
> 	INVITE sip:94099:1001 at 172.17.1.31 SIP/2.0.
> 	Record-Route: <sip:dschulte at 172.17.26.178;ftag=859273871;lr=on>.
> 	Via: SIP/2.0/UDP 172.17.26.178;branch=z9hG4bK33ab.6f0be065.0.
> 	Via: SIP/2.0/UDP 172.17.26.19:5060;rport=5060;branch=z9hG4bKE2FD4189B717447BB8192445A851777B.
> 	From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: <sip:94099 at 172.17.1.31>>.
> 	Contact: <sip:1200 at 172.17.26.19:5060>.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Max-Forwards: 69.
> 	Content-Type: application/sdp.
> 	User-Agent: X-Lite release 1103m.
> 	Content-Length: 293.
> 
> 	#
> 	U 172.17.1.31:5060 -> 172.17.26.178:5060
> 	SIP/2.0 100 Trying.
> 	Via: SIP/2.0/UDP 172.17.26.178.
> 	`From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: <sip:94099 at 172.17.1.31>;tag=viper94099.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Content-Length: 0.
> 	.
> 
> 
> 	#
> 	U 172.17.1.31:5060 -> 172.17.26.178:5060
> 	SIP/2.0 180 Ringing.
> 	Via: SIP/2.0/UDP 172.17.26.178.
> 	From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: "" <sip:94099 at 172.17.1.31>;tag=viper94099.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Content-Length: 0.
> 	.
> 
> 
> 
> 
> 	#
> 	U 172.17.26.178:5060 -> 172.17.1.31:5060
> 	INVITE sip:94099:1001 at 172.17.1.31 SIP/2.0.
> 	Record-Route: <sip:dschulte at 172.17.26.178;ftag=859273871;lr=on>.
> 	Via: SIP/2.0/UDP 172.17.26.178;branch=z9hG4bK33ab.6f0be065.0.
> 	Via: SIP/2.0/UDP 172.17.26.19:5060;rport=5060;branch=z9hG4bKE2FD4189B717447BB8192445A851777B.
> 	From: DOMINIKS PC SIP PHONE <sip:1200 at heat.callsuite.tellumat.co.za>;tag=859273871.
> 	To: <sip:94099 at 172.17.1.31>>.
> 	Contact: <sip:1200 at 172.17.26.19:5060>.
> 	Call-ID: AF0EF5B2-5850-4573-A2FF-F1D50A6B2B65 at 172.17.26.19.
> 	CSeq: 656 INVITE.
> 	Max-Forwards: 69.
> 	Content-Type: application/sdp.
> 	User-Agent: X-Lite release 1103m.
> 	Content-Length: 293.
> 
> 
> 
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