| 摘要 |
A communication device is coupled to an analog telephone and a packet network. The communication device detects an off-hook condition for the analog telephone and transfers a dial tone to the analog telephone, detects digit tones from the analog telephone that indicate a called number and responsively transfers a first message indicating the called number to the packet network, receives a second message from the packet network indicating that a called party associated with the called number is being alerted and responsively transfers a ring tone to the analog telephone, receives a third message from the packet network indicating that the called party has accepted the communication session and responsively stops the transfer of the ring tone to the analog telephone, exchanges analog voice signals with the analog telephone, exchanges voice packets with the packet network, and interworks between the analog voice signals and the voice packets.
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