On 4/11/12 11:48 AM, Olle E. Johansson wrote:
>
> 11 apr 2012 kl. 17:18 skrev Paul Kyzivat:
>
>> On 4/11/12 10:37 AM, Alex Balashov wrote:
>>> Between RFC 3398 and 4694, I am unclear on whether the 'npdi' parameter
>>> can only appear in the user part of a sip: RURI:
>>>
>>> sip:5551212;rn=...;npdi@domain:5060
>>>
>>> or whether it can also appear in the domain part:
>>>
>>> sip:5551212@domain:5060;rn=...;npdi
>>>
>>> All I can find are references to the idea that these parameters appear
>>> "within" the Request URI. Are both cases valid?
>>
>> npdi is defined as a tel uri parameter, not as a sip uri parameter. It
>> makes its way into a sip uri based on the embedding of the body of a tel
>> uri into a sip uri. This results in the parameter appearing in the user
>> part of the sip uri, as in your first example.
> Does the username part actually have parameters - or does it become part of
> the username?
Its a matter of perspective. From the perspective of sip uri syntax
(from 3261) ";npdi" is just some characters in the user part.
But when the user part is viewed as a "telephone-subscriber" from the
syntax of a tel uri it is indeed a parameter.
> I vaguely remember a Nortel-related draft years ago about parameters in the
> username part,
> but can't find it. What's the current state?
I don't know what you are referring to.
Thanks,
Paul
>> The usage in your 2nd example is a mistake. There is no definition of
>> npdi as a sip uri parameter. But its my understanding that this is a
>> fairly common mistake - to the point that SBCs are prepared to deal with it.
>>
>> Thanks,
>> Paul
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>
> ---
> * Olle E Johansson - o...@edvina.net
> * Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden
>
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