主要的问题是：当通话时，主叫和被叫都感受到明显的时延；另外还有一些回音现象。
Theonly issue was that both the other caller and I experienced significant delaybetween when we spoke, and when the other caller heard what we said.
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.
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.
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