Re: [Sip] RFC 4474 and PSTN

[Dean Willis <dean.willis at softarmor.com>]

On Apr 4, 2008, at 3:50 AM, Hannes Tschofenig wrote:
> I would instead not put the SIP Identity header there.
> No additional work needed.


Well, the problem is that you do apparently gain some benefit from the  
presence of the Identity header when used with DTLS-SRTP.

The DTLS-SRTP draft says:

> The certificate fingerprints are sent in SDP over SIP as part of the  
> offer/answer exchange. The SIP Identity mechanism [RFC4474] is used  
> to provide integrity for the fingerprints.

So, to the extent that fingerprint integrity is useful, RFC 4474  
identities are useful even when the assertion of identity is not strong.

--
Dean
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