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[sipcore] RFC 4028 UAS behavior requirement of Require header

Hoil Choi <hoil.choi@hotmail.com> Fri, 28 May 2021 07:08 UTC

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From: Hoil Choi <hoil.choi@hotmail.com>
To: "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: RFC 4028 UAS behavior requirement of Require header
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Date: Fri, 28 May 2021 07:08:32 +0000
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Subject: [sipcore] RFC 4028 UAS behavior requirement of Require header
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Hello,

I hope this mail finds appropriate person or team for an answer to my question on RFC 4028.
I am a SIP enthusiast and always learning a lot about it, but by no means am I an expert; so please excuse my ignorance.

I came across an interesting statement In Section 9 UAS Behavior (or page 16).


If the refresher parameter in the Session-Expires header field in the
   2xx response has a value of 'uac', the UAS MUST place a Require
   header field into the response with the value 'timer'.

Statement seems to convey that UAS must place a Require header with value 'timer' when UAC requests itself to be the refresher.

However, this statement should only be true, if UAC did not put Session-Expire with value of 'uac'.

If UAC, in INVITE request, put Session-Expire with value of 'uac' (itself), UAS should not bother putting Require header field in the response.  Or to be more accurate, UAC should include 'timer' in Supported header, so that UAS doesn't have to bother putting Require header field.

What is the reason behind the requirement of Require header, from UAS in this case?

Thanks!
Hoil Choi
253-273-5442

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