Pre-ring caller identification apparatus and method and call scr

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

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Details

379142, 379210, 379372, 379373, H04M 302, H04M 100

Patent

active

060441488

ABSTRACT:
A telephone apparatus for screening calls on the basis of messages containing message data, the messages being transmitted by a central office before a first ring burst is transmitted by the central office. The apparatus includes a message receiver, a decoder, a ringer and a ringer controller. The message receiver is in communication with the central office line and is operable to receive a message while the telephone is on-hook. The decoder decodes the message to extract the message data from the message. The ringer is operable to sound an audible alarm when a telephone call is received and the ringer controller prevents the ringer from sounding in response to the first ring burst, when the message data satisfies a pre-defined condition.

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