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

-----------------

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
>>
>>
>>     
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