Yup, and the same thing happens at service providers too.
But I think Juha is referring to how does he redirect such without having a 
provider/enterprise.

-hadriel

> -----Original Message-----
> From: Francois Audet [mailto:[EMAIL PROTECTED]
> Sent: Saturday, April 12, 2008 4:35 PM
> To: Juha Heinanen; Hadriel Kaplan
> Cc: Francois Audet; SIP IETF; Paul Kyzivat; Dan WING; Dean Willis
> Subject: Re: [Sip] E.164 - who owns it
>
> I do it on my SIP phone all the time.
>
> I can put ANY SIP URI I want.
>
> If it's a phone number, phone will append the default domain of the phone.
>
> The other phone then INVITE the contact. The enterprise proxy looks at the
> phone number and then decides if it owns it (e.g., it could be another
> phone
> number of a phone in the enterprise). If it owns it, it will route the
> INVITE to that phone. Never goes to PSTN. If it does not own it, it will
> route to the appropriate PSTN gateway (based on least cost routing for
> outbound PSTN gateways and such). That's what happens when I forward to my
> cell phone.
>
> The point of this story is that when ;user=phone is used, the routing is
> based on the phone number. Like it or not, this is what seems to happen.
> In
> other words, it's a functional equivalent to a Tel URI.
>
> There is a reason why people do it like this. Try sending a Tel URI on the
> wire and see what happens with most equipment out there.
>
>
> On Apr12 2008 12:26 , "Juha Heinanen" <[EMAIL PROTECTED]> wrote:
>
> > Hadriel Kaplan writes:
> >
> >> Open-source phones I assume.  Or the SER or Asterisk or whatever
> >> could probably be programmed to do it for your phone.
> >
> > haven't seen any.  sip is now about 10 years old and even such a basic
> > thing as redirecting a caller to my cell phone is not yet possible.
> >
> > -- juha

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