Re: [sipcore] 4244bis-05: additional technical comments

"Worley, Dale R (Dale)" <dworley@avaya.com> Thu, 23 June 2011 16:37 UTC

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From: "Worley, Dale R (Dale)" <dworley@avaya.com>
To: "Worley, Dale R (Dale)" <dworley@avaya.com>, Hadriel Kaplan <HKaplan@acmepacket.com>, "sipcore@ietf.org WG" <sipcore@ietf.org>
Date: Thu, 23 Jun 2011 12:37:45 -0400
Thread-Topic: 4244bis-05: additional technical comments
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Cc: "draft-ietf-sipcore-rfc4244bis@tools.ietf.org" <draft-ietf-sipcore-rfc4244bis@tools.ietf.org>
Subject: Re: [sipcore] 4244bis-05: additional technical comments
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> From: Worley, Dale R (Dale) [dworley@avaya.com]
> 
> An implication of this is that "Supported: histinfo" is redundant and
> can be eliminated from the protocol; a phone can indicate whether or
> not it supports H-I by whether it includes a History-Info header.

Ah, but in 4244, a UAC can include "Supported: histinfo" *without*
also adding History-Info.  So "Supported: histinfo" is required for
backward compatibility with 4244.

Dale