The typical IP PBX can also switch calls between a VoIP user and a traditional telephone user, or between two traditional telephone users in the same way that a conventional PBX does.
One of the quality functions of our latest telephone is three-way calling: you can talk to two people at the same time.
我们最新型电话有许多高品质功能，其中之一就是‘三方通话’：您可以同时跟两个人在电话中交谈。
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On all installations, and particularly on large jobs, twoway radios or internal telephone lines should be used to ensure correct numbering of outlets and patch panels during testing.