Attila,
AFAIK there are no standard rules for how to resolve a tel uri with
phone-context. (You are on your own.)
The context simply defines an abstract namespace within which the local
number is to be interpreted. There are explicit statements that
something of the form
tel:1234;phone-context=+1-555-987
is not to be *assumed* to be equivalent to
tel:+1-555-987-1234
(Of course it *could* be equivalent, but you must not make that
assumption without some specific knowledge of the policies associated
with context +1-555-987.)
IMO it would be a useful thing to standardize a way of resolving phone
contexts. But it hasn't been done yet.
Thanks,
Paul
Attila Sipos wrote:
> thanks for your response.
>
>>> I do not think so. "phone-context" is applicable for local
>>> tel numbers and indicates which context the number belongs
>>> to.
>
> what does "context" really mean here?
> Does it only have significance to the entity that receives it?
>
>>> For example, the tel number can represent a local number
>>> where the phone-context will indicate combination of country and area
> code.
>
> Yes, I have seen this. For example:
> tel:1234;phone-context=+1-555-987
> is the same as:
> tel:+1-555-987-1234
>
> But does a context such as the following have any meaning?
> sip:1234;[EMAIL PROTECTED]
>
> How is the freescale.com part resolved?
> Is there a global registry of these contexts?
> Or is it something that only means something to
> the device that issued the URI with that context?
>
> Regards,
> Attila
>
>
>
>
> -----Original Message-----
> From: Vikram Chhibber [mailto:[EMAIL PROTECTED]
> Sent: 26 March 2008 17:20
> To: Attila Sipos
> Cc: [email protected]
> Subject: Re: [Sip-implementors] phone-context parameter??
>
> Please see inline.
>
> On Wed, Mar 26, 2008 at 10:02 PM, Attila Sipos
> <[EMAIL PROTECTED]> wrote:
>>
>> How does one know what phone-context to use?
>>
>>
>> I have seen examples like this:
>> tel:+1-555-987-1234
>> tel:1234;phone-context=freescale.com
>>
>> Is this the same as:
>> sip:[EMAIL PROTECTED] ?
> This is incorrect. phone-context is part of tel url and is not sip
> domain name.
>> I think maybe not, but instead:
>> sip:1234;[EMAIL PROTECTED]
> Yes, this is correct.
>> which is correct?
>>
>>
>> what would happen if you used sip:[EMAIL PROTECTED]
> This will be treat as a SIP url and accordingly processed by network
> elements.
>
>> Is the phone-context just a way of mapping a DNS name to a tel
>> prefix? So freescale.com maps to +1-555-987 ?
> I do not think so. "phone-context" is applicable for local tel numbers
> and indicates which context the number belongs to. For example, the tel
> number can represent a local number where the phone-context will
> indicate combination of country and area code.
>>
>>
>> Sorry if my questions don't make sense - I'm not even sure what
>> questions to ask.
>>
>>
>>
>>
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>
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