After analizing VoIP call traces, I noticed that:
When a SIP call is placed the caller uses source port 5060 and destination port 5060. The called peer addresses response messages to port 5060 with source port 5060. Now, when a H323 call is placed the caller uses a random source port (X) and destination port 1720. The called peer addresses response messages to port X with source port 1720. Is this a normal behavior? Why in H323 the caller doesn't use port 1720 as source port?
Thanks in advance.