Call establishment for simultaneous analog and digital...

Details Call establishment for simultaneous analog and digital... Call establishment for simultaneous analog and digital...

H - Electricity

04

M

H04M 11/06 (2006.01) H04M 3/22 (2006.01)

Patent

CA 2132991

- 10 - CALL ESTABLISHMENT FOR SIMULTANEOUS ANALOG AND DIGITAL COMMUNICATIONS Abstract A modem, capable of simultaneously coupling voice and data signals, connects local digital terminal equipment (DTE) and a local telephone to a communications link. To prevent the local DTE from responding to a communications containing only voice signals, the local DTE is notified of an incoming communication only after detection of calling tone signals on the communications link. Such signals indicate a remote DTE desires to establish a data communications path with the local DTE. This operation advantageously prevents the modem from transmitting an annoying answer tone to a calling party.

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