[Sipping-tispan] AW: TIP/TIR requirements

["Schmidt, Christian" <[e-mail]>]

Hi Miguel,

some more comments inline

Regards
Christian



> Some comments / questions concerning the TIP/TIR requirements:
> 
> - What happens, when the caller is in PSTN and the callee provides a
SIP
> URI as identity? Will it be translated at the gateway to a E.164
number?

I don't know what people want to do in this scenario, but in my opinion 
the responsibility lies in the calee, so if the callee offers only a SIP

URI, and not both a SIP URI and TEL URL, then the network shouldn't be 
doing this type of translations. Remember that this is not an asserted 
identity, so this should be end-to-end information

Christian: So your proposal is to drop the information in this case.
That
is ok for me. Should this information be included in the requirement
spec?
Proposed extension:
REQ-TIP-2: The identity mentioned in REQ-TIP-1 must be formatted as a
SIP URI [2]
or TEL URL [3]. A translation between SIP URI and E.164 number by the
network
is not requested.


> - How to handle identity restriction from PSTN/ISDN side? Sould the
> gateway delete both identity information and restriction information
in
> this case?

If we build on the trust model, and if we consider that the PSTN Gateway

trusts the IMS network, then I would say no, delete at the 
trusted/not-trusted boundary.

Christian: Then we would need a method to transport identity restriction
information between PSTN Gateway and trusted/non-trusted boundary. This
is not included in the requirements now.
Proposed requirement:
REQ-TIP-4: It must be possible to indicate in a SIP response the
information,
that the callee has requested identity restriction for this call.


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