Re: [Sip] [Sipping] Pls clarify on session timer

["Avasarala Ranjit-A20990" <ranjit at motorola.com>]

Hi Prakash

 

The Server sends a 420 when it doesn't support "timer" option-tag. so its working fine when you remove it from your request.

 

As per section 7.1 of RFC 4028, the UAC SHALL include a Require header with option-tag as "time" in the initial INVITE when it wants the server to support session timer - but this does not necessarily mean that UAC wants the server to perform refresh - but only wants the server to support the session timer.

 

but if the UAC includes a Proxy-Require header with value as "timer", in the initial INVITE then the server MUST support "session-timer" in order to process the request.

 

But again as per RFC Require and Proxy-Require headers are not recommended to be used - but a UAC needs to include "Session-Expires" header field to indicate to the server to apply Session Timer.

Regards
Ranjit

 

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From: sipping-bounces at ietf.org [mailto:sipping-bounces at ietf.org] On Behalf Of Prakash Ganesan
Sent: Friday, March 13, 2009 5:08 PM
To: sip at ietf.org; sipping at ietf.org
Subject: [Sipping] Pls clarify on session timer

Hi All,

I am facing a problem with the session timer.

 

The refesh re-invite contains header field Require: timer and my server is rejecting the request with 420 bad extension. When I remove the header field Reqire: timer, it is working fine.

I am bit confused with the section 7.1 Generating an Initial Session Refresh Request, in RFC 4028 it is referring to the first SIP invite or the first session refresher (re-Invite)

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Cheers
Prakash