On Apr 23, 2008, at 12:29 PM, [EMAIL PROTECTED] wrote:

> Hi,
>    I have been an user of SIP for a while, but never got into the  
> need to extend it.  I have tried to do an extensive research to see  
> if there are any draft or RFC that handles the requirements that I  
> am requested to do.  Here is the scenario that I am trying to fulfill.
>
> A UA (custom hardware/software) wants to place or change the call  
> into a secure call.  It notifies the other participant by an INVITE  
> or NOTIFY and both UA agree on the change and the details of the  
> security.  There are several different method of securing the call,  
> and that would be included in the parameter passed between the UA.   
> If this is not possible is there a way to embed the parameters into  
> the header of the INVITE or NOTIFY so at least both UA know of the  
> request?
>

What do you mean, "secured call"? This term means many different  
things to even more different people.

You might look at:

  http://www.ietf.org/internet-drafts/draft-ietf-sip-sips-08.txt

which has completed working group last call and I'm about to send to  
the IESG, and at:

http://www.ietf.org/internet-drafts/draft-ietf-sip-media-security-requirements-04.txt

and

http://www.ietf.org/internet-drafts/draft-ietf-sip-dtls-srtp-framework-01.txt

which, if I recall aright, are currently in working group last call.

--
Dean


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