Re: [sipcore] I-D Action: draft-ietf-sipcore-sip-push-23.txt

[Paul Kyzivat <[e-mail]>]

Christer,

In section 5.3:

    5.3.  SIP URI Comparison Rules

    When a SIP proxy compares two SIP URIs, the proxy uses the URI
    comparison rules defined in [RFC3261], with the following addition:
    the pn-prid, pn-provider and pn-param SIP URI parameters MUST also
    match in order for the comparison to be successful.

    If only the pn- SIP URI parameters listed above match, but other
    parts of the compared URIs do not match, a proxy MAY still consider
    the comparison successful, based on local policy.  This can occur in
    a race condition, if a UA modified some parts of the Contact URI in
    the most recent REGISTER request, but the Request-URI of a SIP
    request addressed towards the UA still contains the old parts.

I *presume* you only intend these extended matching rules to be applied 
in certain contexts. But you don't say anything about that. Someone 
might read this as applying to all the places in 3261 where matching is 
used.

Please add a few more words clarifying those circumstances when these 
extended matching rules apply.

	Thanks,
	Paul