DTMF signaling on four-wire switched 56 KBPS lines

Details DTMF signaling on four-wire switched 56 KBPS lines DTMF signaling on four-wire switched 56 KBPS lines

1995-10-06

1998-05-05

Olms, Douglas W.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370522, 379257, 375371, H04J 306, H04M 322

Patent

active

057486379

ABSTRACT:
Dual tone multi-frequency (DTMF) address signaling on four-wire switched 56 kilobits per second (Kbps) service lines is obtained by determining the proper byte boundary information. An iterative learning process is used with an existing digital switching network having a call progress indication capability. The learning process steps through each possible byte alignment until the call progress protocol indicates that a proper byte alignment has been achieved. Once a proper byte alignment has been determined, that byte alignment information is retained for subsequent use, thus avoiding the need to repeat the learning process.

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