[SIPForum-techwg] Question re Application Server

[Francois Audet]

I think it would be worthwile to explain the respective usage of
phone-context
and domain when routing.

In particular, for "incoming calls". 

> -----Original Message-----
> From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org] On Behalf Of Chris Sibley
> Sent: Thursday, September 07, 2006 8:21 AM
> To: Paul Kyzivat; SIP Forum Tech WG
> Subject: Re: [SIPForum-techwg] Question re Application Server
> 
> Hi Paul,
> 
> Firstly, my apologies for taking so long to respond. I have 
> been on vacation and it's taken a while to dig myself out.
> 
> Secondly, thanks for your very astute comments! You are quite 
> right that, given the current wording, calls between 
> Enterprises (handled by the SP) would require a B2BUA. When 
> this text was written, we were
> (only) contemplating calls that ORIGINATED from the PSTN and 
> were destined to an Enterprise. So, in this scenario, since 
> the headers are actually being created for the first time the 
> text would be correct.
> 
> However, as you pointed out, there is certainly significant 
> value in the SP handling calls BETWEEN Enterprises. That 
> said, I think we need to clarify Section 13 to define rules 
> for calls that originate from the PSTN (current wording) as 
> well as calls that originate from another Enterprise (and 
> handled by the SP, of course). 
> 
> What do you think? If everyone agrees I can put together 
> something today / tonight and send it out for your review..
> 
> Thanks,
> 
> --Chris
> 
> 
> > -----Original Message-----
> > From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org]
> On
> > Behalf Of Paul Kyzivat
> > Sent: Friday, September 01, 2006 1:41 PM
> > To: SIP Forum Tech WG
> > Subject: [SIPForum-techwg] Question re Application Server
> > 
> > I am trying to understand the nuances of draft 5, and there is
> something
> > I am unsure of: Is the Application Server required to act 
> as a B2BUA,
> or
> > is it permitted to act as a proxy? There is no mention of B2BUAs in
> the
> > document, but I think it may be implied.
> > 
> > In particular, suppose we have one service provider servicing two
> > enterprises: acme.com and bozo.com.
> > 
> > Acme has a phone number +12125551234, and Bozo has 
> +14085556789. Then 
> > Acme calls Bozo. According to the spec, the call from Acme is
> addressed
> > as:
> > 
> > 	INVITE sip:+14085556789 at serviceprovider.net;user=phone SIP/2.0
> > 	To: <sip:+14085556789 at serviceprovider.net;user=phone>
> > 	From: <sip:+12125551234 at acme.com;user=phone>
> > 
> > But then the instructions for service provider addressing say that
> when
> > this is sent to Bozo that it should be addressed as:
> > 
> > 	INVITE sip:+14085556789 at bozo.com;user=phone SIP/2.0
> > 	To: <sip:+14085556789 at bozo.com;user=phone>
> > 	From: <sip:+12125551234 at serviceprovider.net;user=phone>
> > 
> > To change the To and From fields in this way requires that the 
> > Application Server be a B2BUA. If this is routed using 
> proxy routing, 
> > then the message going to Bozo would perhaps look like:
> > 
> > 	INVITE sip:+14085556789 at bozo.com;user=phone SIP/2.0
> > 	To: <sip:+14085556789 at serviceprovider.net;user=phone>
> > 	From: <sip:+12125551234 at acme.com;user=phone>
> > 
> > So, is it a requirement to have a B2BUA in the path, or is proxy
> routing
> > ok?
> > 
> > 	Thanks,
> > 	Paul
> > _______________________________________________
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> 
> 
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