Benny
In postings from Jonathan Rosenberg yesterday, it has been clarified that
there must only be one Conact in an INVITE or 2xx OK to INVITE. Only 3xx
responses, REGISTER messages, 2xx responses to REGISTER can have multiple
contact headers. Maybe the updated spec will also spell this explicitly out.
This answers both the questions raised in this posting.
----- Original Message -----
From: "Benny Prijono" <[EMAIL PROTECTED]>
To: "Arunachalam Venkatraman" <[EMAIL PROTECTED]>
Cc: "Jonathan Rosenberg" <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, March 28, 2001 5:55 AM
Subject: Re: [Sip-implementors] Qustion on Contact Header
> Arunachalam Venkatraman wrote:
> >
> > 1.When does it make sense to have multiple Contact headers in a INVITE
> > request? I am trying to imagine scenarios where this would be useful.
One
> > possibility is when there are multiple interfaces that you may be
reached at
> > but you have no single domain name that translates to these addresses.
Seems
> > contrived, though.
> >
>
> I think what the draft is saying is that you can insert not only the
> SIP URL, but also your email or HTTP url. When there happens to be
> multiple SIP URL contacts, then I think the draft is silent about
> this.
>
> More, I'm quite interested about this quote (in section 6.15,
> Contact):
> "The Contact value SHOULDNOT be cached across calls, as it
> may not represent the most desirable location for a particular
> destination address."
>
> Does it mean I can NOT save the Contact (SIP) URL to my address book?
> (I think yes, I can)
>
> If I can, then can I specify multiple SIP URL in the contact, with
> each of them is completely different address, such as my office SIP
> URL, home SIP URL, my URL registered to other SIP service I found in
> web, etc.?
>
> I think the answer is again yes, I can. The UAS should still be able
> to choose the URL used for this Call-ID, based on the qvalue.
>
> But in any case, the draft should be clear about this.
>
> > 2. If there are multiple Contacts in an INVITE, which of these does the
UAS
> > use to copy the name-addr value from, into the Route header?
> >
>
> Choosing only from the SIP URL Contacts, choose one with highest
> qvalue?
>
> --
> cheers,
> Bennylp
>
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