If by "SIP Identity" you mean RFC 4474, it's not deployable as I think you 
know; and even were it deployed it wouldn't actually provide identity for 
E.164's which are the most common form of identifier for SIP deployments 
(including 3gpp ones); nor does it provide any new/additional privacy benefits 
afaik.  Essentially the RFC was dead on arrival, and we all knew it.

-hadriel


On Sep 13, 2013, at 3:20 AM, Hannes Tschofenig <[email protected]> 
wrote:

> There may well be a mismatch between data protection laws and lawful 
> intercept but I think it is outside my realm to solve that problem.
> 
> On the SIP Identity and 3GPP: To my knowledge the 3GPP IMS does not make use 
> of SIP Identity; it only relies on PAI.

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