For the SDP protocol, the m line is also called the media line, which describes the information such as the media type supported by the sender, and the second parameter is?

For the SDP protocol, the m line is also called the media line, which describes the information such as the media type supported by the sender, and the second parameter is?
A . Transmission Protocol
B. Media name
C. Number of four payload types supported
D. Port number

View Answer

Answer: D