Patent ID: 7184428

Claim:
A telecommunications interface for communicating subscriber data including voice data, signaling data, and user data between a digital network, a digital loop carrier having an analog interface to connect telephones and a digital circuit connecting a telephone switch to other telephone switches, and a subscriber link to subscriber premises equipment (SPE), said interface comprising: a controller; a modem that modulates and demodulates the subscriber data to and from the subscriber link to generate a digital stream including the voice data, signaling data and user data; a digital filter that separates the voice data from the digital stream, said controller applying the voice data to the digital circuit when the signaling data indicates the voice data is to be transmitted by the digital circuit, and said controller applying the voice data to the digital network when the signaling data indicates the voice data is to be transmitted over the digital network; and a DTMF generator; said interface being connected to a switched network requiring the transmission of DTMF tones for calls to be routed through the switched network, and said DTMF generator generating DTMF tones in response to said signaling data indicated that the call is to be transmitted through the switched network.