Method, system, and device for controlling a token for an auxiliary stream in a multi-point double-stream conference

A multi-point control unit, MCU, comprising:

• a token request message receiving module, adapted to receive a token depriving request messages from conference terminals in a multi-point double-stream conference;
• a token depriving judging module, adapted to judge whether to deprive a token from a first conference terminal according to an identifier, ID, carried in the token depriving request message;
• and
• a token depriving request module, adapted to receive a judgment result from the token depriving judging module, release the token when deciding to deprive the token, and receive a token depriving request response message from the conference terminal that owns the token.

A chairman conference terminal, comprising:

• a token request message receiving and sending terminal, adapted to receive and send a token depriving request message;
• a token depriving judging module, adapted to judge whether to deprive a token from the current conference terminal according to an identifier, ID, carried in the token depriving request message, and send a judgment result;
• and
• a token depriving request message sending terminal, adapted to receive the judgment result from the token depriving judging module, and send a token depriving request message carrying an ID of the chairman conference terminal to a multi-point control unit, MCU, when deciding to deprive the token.