根据本发明，能够实现互不控制，主叫控制、被叫控制和双方控制功能。

In this invention, calling control, called control and cross control can be achieved.

youdao

根据本发明，能够实现互不控制，主叫控制、被叫控制和双方控制功能。

In this invention, calling control, called control and cross control can be achieved.

youdao