> From: Rhys D Ulerich > > > Is there a way for a network monitoring agent which sees both > > signalling paths of a single call > > handled by a B2BUA to know that the two separate transactions belong > > to the same call? Or is > > this intelligence only knowable by the B2BUA which set up the call? > > One simple way to do it is to add a header that places the upstream > Call-ID into the downstream's messages via a unique header.
Of course, you really don't need such a mechanism for the B2BUA's use itself, since it maintains a table of the dialog-identifier correspondances. Using a special header (as suggested above, or in draft-henrikson-sip-original-dialog-id) can get fragile when the dialog passes through more than one B2BUA, as you get more than one instance of the header in a message - the actors should make sure they stack the headers in a defined way, so the monitoring agent can tell the order of the dialogs the request has passed through. It might be better to put this information into a new parameter on the Via header. Dale _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
