Technique for automatic identification of a remote modem

Details Technique for automatic identification of a remote modem Technique for automatic identification of a remote modem

H - Electricity

04

M

H04M 11/06 (2006.01) H04L 29/12 (2006.01)

Patent

CA 2094189

In the public switched telephone network, an originating modem can identify an answering modem, e.g., as to the type of modem it is, by detection of a low-level identification signal sent from the answering modem. The low-level identification signal is hidden within an industry standard "answer tone," e.g., a CCITT V.25 answer tone of 2100 Hz. If the low-level identification signal is detected by the originating modem, the industry standard "handshaking" procedure is terminated and a non-standard handshaking procedure is implemented. If the identification signal is not detected by the originating modem, the industry standard handshaking procedure is simply completed.

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