Dual-tone multi-frequency signal transfer protocol

Details Dual-tone multi-frequency signal transfer protocol Dual-tone multi-frequency signal transfer protocol

1996-12-16

1998-11-10

Hunter, Daniel S.

Telephonic communications

Telephone line or system combined with diverse electrical...

379 9001, 379 9301, 379 9308, 379 9331, 379 9332, 379 9333, 379 9334, 375222, 370525, 370526, H04M 1100, H04B 138, H04J 312

Patent

active

058355740

ABSTRACT:
A handshake between sending and receiving devices (10) that exchange DTMF signals across a network (14) is accomplished by having the receiving device send a DTMF ready tone (digit) for a prescribed interval following receipt of a call set-up message received after the sending device has initiated a call. Upon receipt of the DTMF ready digit, the sending device sends to the receiving device a data message includes a string of digits of interest prefixed by M header digits. After receiving at least a portion of the data message, the receiving device stops transmitting the ready digit. Once the receiving device has received the entire data message, the receiving device strips the protocol digits (the M header digits and any of the ready digits received due to echo). By analyzing the stripped protocol digits, the quality of the handshake between the receiving and sending devices can be determined.

REFERENCES:
patent: 4694450 (1987-09-01), Staab
patent: 4771417 (1988-09-01), Maxwell et al.
patent: 5153897 (1992-10-01), Sumiyoshi et al.
patent: 5418842 (1995-05-01), Cooper
patent: 5577105 (1996-11-01), Baum et al.
patent: 5581560 (1996-12-01), Shimada et al.

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