Which DTMF relay method is advertised when the originating SIP gateway sends an INVITE message with a Call-Info header shown?
How many SIP signaling transaction(s) took place in this SIP message exchange between two SIP user agents?
How many SIP signaling dialog(s) took place in this SIP message exchange between two SIP user agents?
What is the minimum number of TCP sessions needed to complete a H.323 call between two H.323 gateways using slow start?