DTMF signaling on four-wire switched 56 KBPS lines
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United States of America Patent
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May 5, 1998
Issued Date -
N/A
app pub date -
Oct 6, 1995
filing date -
Jan 3, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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