[Sip] Doubt related to use of Supported and Require header.

["Vineet Gupta" <gupta.vineet at gmail.com>]

Hi,

 

I have a small doubt related to use of Supported and Require header. While from RFC 3261 it is clear the Require header is used by the UAC and UAS to enforce the extension implemention for a particular session, while the Supported header is mostly used by UAC to express the extensions which can be enforced by UAS through the Require header.

 

My doubt is that, is it mandatary that every extension that is present in Require header must be present in Supported header in the request? According to me, presence/absence of Required extensions in Supported header does not make any impact on UAS handling.  Even if it is not mandatory, what is the preferred approach?

 

Regards,

Vineet.

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