>I have a question for SIP registrar implementors.
>Do you treat the following registrations different :
>
>REGISTER sip:domain.com SIP/2.0
>To: <sip:[EMAIL PROTECTED];user=ip>
>
>and another in which To header is
>To: <sip:[EMAIL PROTECTED];user=phone>

Yes these are different.

>Why is the spec silent about usage of user parameter
>in the To header SIP URL ?

Section 2 mentions user-param (user parameter) the default value is "ip", 
section 2.1 tells you how to compare SIP URLs and is explicit if the 
user-param is missing it is considered to be "ip" for the comparison. I fail 
to see where it is silent.

James Undery

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