prashanth.me wrote:
> Hi Paul,
> Example SIP URI given by Iñaki Baz, does not contain the ;user=phone
> parameter.
> Should we assume that the userinfo part of the below SIP URI is a
> telephone-subscriber number or not?
> -----------------
>
> sip:12345678;phone-context=mydomain....@provider.com
Who is "we"?
The server responsible for provider.com will *know* what this
represents. Others that are privy to the policies of provider.com may
also know.
But in general, somebody not aware of those specific policies will not
*know* if this represents a telephone-subscriber or not. It can *assume*
this if it wants, but then must understand that this is a guess that may
be wrong.
In any case, what would somebody else do with this if it knew this
represented a telephone-subscriber? Is it to display the URI in a more
user-friendly way? Or to route requests in ways that bypass
provider.com? As far as sip standards are concerned, requests to this
address need to reach a server for provider.com.
You can of course do whatever you are comfortable doing. But there are
no guarantees you are doing the right thing.
Thanks,
Paul
> -----------------
>
> Thanks,
> Prashanth M E
>
> Paul Kyzivat wrote:
>> The form of the user part is really the responsibility of the owner of
>> the domain. user=phone is really only meaningful if the domain owner
>> allows/supports that. In absence of user=phone, the domain may *choose*
>> to treat the user part according to tel uri syntax, or not.
>>
>> *if* user=phone is present, and *if* the domain supports use of
>> user=phone, then a user part that doesn't start with "+" must be a local
>> number in accord with telephone-subscriber, as Iñaki says below.
>>
>> Paul
>>
>> Iñaki Baz Castillo wrote:
>>
>>> El Viernes 05 Marzo 2010, hanifa.mohammed escribió:
>>>
>>>> Thanks for the response. Pl clarify my assumption.
>>>>
>>>> 1. So, when there is no "user=phone" parameter in the SIP uri, there is no
>>>> context of Local or Global.
>>>> Or is there any other way to figure out whether a SIP uri is global or
>>>> local?
>>>> 2. Simply the presence of '+' in the userinfo part of the SIP uri is not
>>>> suffice enough to declare it as
>>>> a global SIP uri.
>>>>
>>> If ;user=phone is present you can assume that the SIP URI userinfo is a
>>> telephone-subscriber number, following same rules (if it begins with "+"
>>> then
>>> it's absolute). In order to be local it would be like:
>>>
>>> sip:12345678;phone-context=mydomain....@provider.com
>>>
>>>
>>>
>> _______________________________________________
>> Sip-implementors mailing list
>> Sip-implementors@lists.cs.columbia.edu
>> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>>
>>
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
