| 词条 | Telephone signaling interface |
| 释义 | {{Unreferenced|date=December 2009}} There are many interface standards between analog telephone central office equipment and customer-premises equipment. Single voice paths generally include analog audio connections, either a two-wire circuit or four-wire circuit plus signaling paths to indicate call progress and status information, such as ringing, answer supervision, etc. Some of the known interface types are
1 : Telephony signals |
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