[MMUSIC] Further Question to MIKEY embedding with kmgmt-ext.

 Hi,

I've got another question to MIKEY usage. When a SIP dialog has been
established and further offer/answer messages are to be sent, does one need
to include MIKEY container when no changes to the established MIKEY
parameter are there?

regards
  Steffen

> -----Original Message-----
> From: mmusic-bounces@ietf.org 
> [mailto:mmusic-bounces@ietf.org] On Behalf Of Fries Steffen
> Sent: Monday, April 11, 2005 8:55 AM
> To: elisabetta.carrara@ericsson.com
> Cc: mmusic@ietf.org
> Subject: [MMUSIC] Question to MIKEY embedding with kmgmt-ext.
> 
> Hi Elisabetta,
> 
> recently a question came up in the usage of the key 
> management extentions for SIP to use MIKEY:
> 
> Section 3.1.2 of draft-ietf-mmusic-kmgmt-ext-14 contains the following
> statement: 
> 
> "If the key management rejects the offer and the session 
> needs to be aborted, the answerer SHOULD return a "488 Not 
> Acceptable Here" message, optionally also including one or 
> more Warning headers (a 306 "Attribute not understood" when 
> one of the parameters is not supported, and a 399 
> "Miscellaneous warning" with arbitrary information to be 
> presented to a human user or logged, see Section 20.43 in 
> [SIP]). Further details about the cause of failure MAY be 
> described in an included message from the key management 
> protocol. The session is then aborted (and it is up to local 
> policy or end user to decide how to continue)."
> 
> Concerning the sentence in bold (The sentence before the last 
> sentence in quotes), how does it do that in the following scenario?:
> A UA receives an INVITE request containing an SDP offer with 
> a MIKEY I_MESSAGE that is for some reason unacceptable. The 
> receiving UA will return a 488 response, which does not 
> contain an SDP answer. Therefore there is no way of embedding 
> a MIKEY R_MESSAGE to indicate the error. Is there any way to 
> signla the MIKEY error in this case?
> 
> Regards
> 	Steffen
> 
> 
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