[SIPForum-discussion] doubt about "contact field"

[Singh, Indresh (SNL US)]

CANCEL message has to be exactly same as INVITE request and also should be sent to the same host port as original INVITE. So in this case gateway correctly rejects the message.

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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Knupp, Varlei Fernandes
Sent: Thursday, March 22, 2007 11:31 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] doubt about "contact field"


 
Hi to all,
 
I have a doubt about "contact field".
 
The proxy send a "INVITE" message =INVITE sip:33133010 at 192.168.2.100:5060 SIP/2.0 to Gateway
 
The gateway send  a "session progress" message to proxy, but this message has contact field = Contact: <sip:1100 at 192.168.2.100>
 
The User disconnect the call.
 
The proxy send a "CANCEL" message to gateway = CANCEL sip:1100 at 192.168.2.100:5060 SIP/2.0  
 
So the gateway reject the message.
 
Who is correct? 
- The Gateway because reject the call because the proxy changed the header in the message CANCEL
- The Proxy because when the gateway sent contact field = <sip:1100 at 192.168.2.100> the header CANCEL message now is  CANCEL sip:1100 at 192.168.2.100:5060 SIP/2.0.
 
thanks a lot
 
 
Varlei Fernandes Knupp 

SIEMENS Communications

Customer Services Enterprise

RCC São Paulo - Technical Support

Tel.: +55 11 3817 2659 

Fax: +55 11 3817 2613

varlei.knupp at siemens.com <blocked::mailto:varlei.knupp at siemens.com> 

 
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