[Sip] use of 420 in draft-polk-sip-resource-02.txt

["Bob Penfield" <bpenfield@acmepacket.com>]

I have a comment on the use of the 420 response in the resource priority
draft.

In section 4.2, it says the 420 (Extension Required) response is used if the
SIP element does not understand the "Resource-Priority" tag or it does not
understand the namespace or priority value.

I believe this is in conflict with the use of the 417 response described in
section 4.1 and the proper use of 420 as described in RFC 3261.

The 420 response should only be used if it does not understand the feature
tag. The 417 response (as described in section 4.1) should be used when it
does not understand the namespace or priority value. If 420 was only used as
described in 3261, the Accept-Resource-Priority header would not appear in a
420 response.

cheers,
(-:bob

Robert F. Penfield
Chief Software Architect
Acme Packet, Inc.
130 New Boston Street
Woburn, MA 01801
bpenfield@acmepacket.com




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