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Re: [Sip] Contact header in 200 OK

Hello Sandip

Why do you say that RFC doesn’t talk about Contact for 200 OK response of INVITE?

It says that Contact header is mandatory for INVITE response only.

 

Header field          where   proxy ACK BYE CAN INV OPT REG
Contact                2xx           -   -   -   m   o   o
 
For OPTIONS, REGISTER it is optional and for rest of the messages (BYE, CANCEL ) it is forbidden.
 
Regards
Devki

 

 

From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of sandip gangakhedkar
Sent: Thursday, August 06, 2009 10:46 AM
To: sip at ietf.org
Subject: [Sip] Contact header in 200 OK

 

Hi all,

I'd like to know if the Contact header is mandatory for a 200 OK response to an INVITE request.

The RFC doesnt explicitly mention anything in this regard although a 200 OK is mandatory for a REGISTER request.

If the originating endpoint receives the Contact header in the 180 Ringing response (which I assume is mandatory), then it knows the location of the remote endpoint, in which case the Contact header would be redundant in the 200 OK response.

Waiting for some expert intervention.. :)

Regards,
--
Sandip Gangakhedkar
Mobile:+91-97396-99916
Office: +91-80-4363-3899
Profile: http://www.linkedin.com/in/sandipg


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