Subject: [Sip] REGISTER Method: How does proxy interpret the address associations

From: Venkatasubramanian Tiruthani <[email-masked]>
Date: Thu, 21 Feb 2002 11:31:05 -0800 (PST)

The REGISTER method allows a UAC to associate the
address-of-record with the one or more contact
addresses. Each of the contact address could
correspond to a transport address or it could simply
be another name.

For example let us say, that the following contact
addresses are associated with the user with
address-of-record sip:[email-masked]:

sip:[email-masked]
sip:[email-masked]
sip:[email-masked]

The above register method can have two possible
interpretations:

1) When a call is made to [email-masked], the proxy
should place a call to either [email-masked], or
[email-masked] (or)
[email-masked]. This interpretation is more
like a follow me service, where the contact addresses
represent alternative addresses where the user can be
reached.

2) When a call is made to [email-masked] or
[email-masked] or [email-masked],com the
call should always be placed at [email-masked].
In this interpretation, the contact addresses
represent the same person.

Is there a way for a proxy to unambiguously interpret
using existing provisions in SIP Protocol If there is
no such provisions, should future versions consider
them? Or, is this outside the scope of SIP protocol -
and is left to proxy implementors.

Your input on this will be very much appreciated.
Regards,

Saran Tiruthani

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