Under static NAT networking, the signaling description of the public network terminal called the private network terminal is correctly (). (3 answers).

SIP is an application layer protocol that is independent of the transport layer protocols below and can be hosted on different transport protocols, such as UDP/TCP/TLS/SCTP, currently Most commonly used TCP. ( )

What are the main ways to map NAT? ( )

Which of the following messages indicates that the SIP server failure could not complete the processing of the correct message. ( )

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.