Re: [Sip] Question on Service Route Discovery draft and multiple contacts per AoR

inline.

Dean Willis wrote:
> 
> The current text in draft-ietf-sip-scvrtdisco-03.txt says, in "6.3
> Procedures at the Registrar":
> 
>    A REGISTER operation performing a Fetching Bindings (i.e.  no Contact
>    header field is present in the request) SHOULD return the same value
>    of Service-Route as returned in the corresponding previous REGISTER
>    response for the address-of-record in question.  In some cases, the
>    Service-Route may be dynamically calculated by the registrar rather
>    than stored, and the decision as to whether this route should be
>    recalculated in the event of a Fetching Bindings operation is left to
>    the implementation.
> 
> 
> Ben Jenkins pointed out to me that this may be unclear in cases where there
> are multiple contacts registered for a specific AoR.
> 
> We do not state explicitly that the Service Route is common to all contacts
> for the AoR. Is it really? Do we need to add anything here for clarity?

I would be surprised if its the same. After all, the Contacts could have 
been registered from completely different visited networks. Ideally, 
there is one service route per contact, and so the REGISTER response 
would indicate a service route for each contact in the response. That 
would be a big change from whats in the spec now though.

-Jonathan R.

-- 
Jonathan D. Rosenberg, Ph.D.                600 Lanidex Plaza
Chief Scientist                             Parsippany, NJ 07054-2711
dynamicsoft
jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com

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