The wall riding scheme is a simple public and private network crossing method, which connects different network ports of the MCU in different networks to realize the terminals in different networks to access the same conference.

The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.

All MCUs under the same service area must have the same prefix number.

PCM coding mainly includes three processes: sampling, quantization, and coding.

The INFORMATION that the IP header in the SETUP message does not contain Is there? ( )