[SIPForum-techwg] comment/question on draft 3

[Chris Sibley]

Comments inline below..

Thanks,

--Chris

> 

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> From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org]
On
> Behalf Of Klaus Darilion
> Sent: Tuesday, December 06, 2005 4:12 AM
> To: SIP Forum Tech WG
> Subject: [SIPForum-techwg] comment/question on draft 3
> 
> Hi!
> 
> I have problems to understand the meaning of "Privacy: id" in section
> 11.1.2. The (shortened) SIP request at step 3.a. is:
> 
> INVITE sip:+17705551211 at serviceprovider.net;user=phone SIP/2.0
> From: "Acme Rockets Sales"
>   <sip:+16789901234 at acmerockets.com;user=phone>;tag=1648468
> Privacy: id
> P-Preferred-Identity: "John Doe"
>   <sip:+16789902000 at acmerockets.com;user=phone>
> 
> If I understand it correctly, then +16789901234 (From) is the main
phone
> number fo the enterprise, whereas +16789902000 is the DID of the
caller.
> Is this right?
> 

Yes, that is correct.

> Further, (if I got it righ) at the service provider, the SAS will
> verifiy the P-Preferred-Identity. If this user is allowed to use the
> preferred identity, the SAS will replace the P-Preferred-Identity
with:
> 
> P-Asserted-Identity: "John Doe"
>   <sip:+16789902000 at acmerockets.com;user=phone>
> 
> If the call leaves the trusted service provider network, the
> P-Asserted-Identity header must be removed (Privacy: id). Thus, the
> callee will see +16789901234 as CLI.
> 

Correct.

> So, how will the PBX signal to the service provider that it should use
> +16789902000 as CLI also in the PSTN?
> 

By putting the SAME value in the FROM and P-Preferred-ID fields (i.e.
+16789902000 in both fields). 

Alternatively, the PBX could simply use option one for conveying
identity and put +16789902000 in the FROM field (i.e. not use the
P-Preferred-ID field at all.) As stated in the document, option two
should only be used when the PBX wants to implement a shared group
appearance.

> So, how will the PBX signal to the service provider that it should
> restrict all CLI information? Privacy=?
> 

By putting "Anonymous" <sip:anonymous at anonymous.invalid> in the FROM
field. This, along with the privacy=id header field should satisfy the
requirement.

> I think this issue is to less addressed in this draft. There are cause
> code to SIP response code mappings, but where are the mappings from
SS7
> CLI information to SIP (CLIP/CLIR, network provided CLI, user provided
> CLI ... like in the Remote-Party-ID draft)?
> 

I agree that we need to investigate this area in more detail. Question:
do you (and the other list members) think this needs to be a section
that is finalized before we publish the first version of the spec, or is
this something we can get done in the next release?

> Thanks for clarifications
> Klaus
> 
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