In an RTP packet, the initial value of the Sequence number is random, no RTP packet is sent, and the sequence number is incremented. The receiver detects packet loss and rebuilds packets based on it.

TCs are capability exchange requests that inform the peer of the capability information ( ).

Under the video service, for public network calls to the private network can be changed to private network calls to the public network, the public and private network traversal technology used is generally ( ).
(2 answers).

For the SDP protocol, line 0 contains parameters related to the session owner, where the first parameter is represented. ( )