From: [EMAIL PROTECTED]

   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?

If both UAs are your design, you can just add a private header (whose
name starts with "X-") to carry the additional information.  SIP
agents that do not understand the header are required to ignore it.

Dale
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