Re: [Sip] Contact header in 200 OK

["T Satyanarayana-A12694" <satyanarayana.t at motorola.com>]

The RFC does mention this. In table 2, on page 162.

 

      Header field          where   proxy ACK BYE CAN INV OPT REG
      ___________________________________________________________
      Contact                2xx           -   -   -   m   o   o

regards
Satya T

 

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From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of sandip gangakhedkar
Sent: Thursday, August 06, 2009 8:16 PM
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
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