Hi,
Thanks for response for the last query.
I have doubt about the table 3 uses. As per the section 21.4.16 421
Extension Required
The UAS needs a particular extension to process the request, but this
extension is not listed in a Supported header field in the request.
Responses with this status code MUST contain a Require header field
listing the required extensions.
And table 3 mention that this header field may present in all the request
and response.
So the sip entity should validate request or response based on the table 3
or MUST clause in rfc. Because here seems some conflict between the table 3
and the section 21.4.16.
Because this is one place I have found different behavior in rfc.
Please correct me if I am wrong.
Thanks & Regards,
Ravi Kumar
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