There are lots of ways to accomplish this. For instance:
- the UA could register separately for each of the "virtual" numbers,
using unique contact addresses. Then it can tell by which value is in
the R-URI. (Of course then these aren't really virtual any more.)
- the provider could insert an Alert-Info header into the request with
unique values for each virtual number.
- The provider could do proper forwarding from the virtual numbers to
the real number: leaving To with the virtual number and the R-URI with
the primary number. Then the UA could choose ring tone based on the
value of the To-URI. (This however would not work right if the call was
originally to some other number, and then forwarded to one of the
virtual numbers.)
- the provider could do proper forwarding, and then the UA could look
thru the History-Info header, if present, looking for its virtual or
primary number, and decide what to play based on what it finds.
Take your pick.
Paul
jc.huang wrote:
> Hi,
>
> A service provider supports the following SIP service:
> A user could apply a primary number and serveral virtual numbers, for
> example, primary number is 213xxxxxx in Los Angeles, vitual numbers are
> 312xxxxxx in Orlando, 616xxxxxx in Michigan etc. He only register the SIP
> account of 213xxxxxx on his SIP device, then Orlando's people just dial
> 312xxxxxx to call him, and similar process happens on 616xxxxxx.
>
> Several months ago, I borrowed one SIP account from the provider to test the
> SIP service. In the incoming INVITE message from its proxy server, FROM
> header includes caller number, TO header consists of my primary number and
> REQUEST_URI is the same with TO header. I couldn't see any informations about
> virtual numbers in INVITE message.
>
> Now, I hear from the carrier has improved the SIP service, it is interesting
> that when calls from different virtual numbers are received, the ring
> tone(not ringback) of SIP device are diffenent. I don't know, but want to how
> the carrier realize it.
>
> If the carrier realizes it by Multi-Line way as RFC4504 refers to, it isn't
> complex. But is it possible that the incoming INVITE message has nothing
> about virturl numbers but some parameters of ring tones? so my question is
> whether some parameters in SIP or SDP protocols could configure ring tone
> during SIP calls.
>
> Thanks and regards,
>
> luke
> 2006-12-04
>
>
>
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