virtual PBX

The testing results show that: the callback function is relatively stable, and already have a large number of customers; telephone voice email, number follow me, and virtual PBX have part of the customers and are still in the development stage.

测试结果表明：电话回拨功能比较稳定，并已经拥有大量的客户；电话留言Email、号码随身行、虚拟交换分机目前拥有一部分客户，还处于发展阶段。

The SIP Trunk provides a virtual SIP relay which is similar to the traditional PSTN relay to enable the direct interconnection between the internal IP-PBX of enterprises and the external INTERNET IP phone operators.

SIP Trunk提供了一种类似于传统PSTN中继的虚拟SIP中继来使企业IP-PBX与外部的INTERNET电话运营商之间通过IP进行直接互连。