Coverage of redirected calls

Details Coverage of redirected calls Coverage of redirected calls

1996-11-12

1999-02-02

Zele, Krista

Telephonic communications

Special services

Anonymous party

379211, 379221, 379225, 379178, H04M 342, H04M 700, H04M 300

Patent

active

058675680

ABSTRACT:
Calls redirected off-net, which includes call forwarding and call coverage, is provided at the switch to which the call is initially directed (the principal party's switch), by monitoring the redirected off-net connection with a call classifier and listening for the appearance of ringback tone and the appearance of voice frequency energy. The call is allowed to be completed to the off-net covering end-point if voice frequency energy is detected before ringback tone appears or if voice frequency energy appears within a predetermined time-out interval. If ringback tone continues beyond a time-out interval, if voice-frequency energy is not detected within the time-out interval, or if a call progress tone other than ringback is detected, further processing of the call is continued at the principal party's switch to determine if another covering point is listed. If no other coverage point is listed, monitoring of the call continues until the calling party hangs up. A simulated bridged appearance is maintained at the originating switch to allow the call to be picked up at the covered station at any time.

REFERENCES:
patent: 4150257 (1979-04-01), Fenton et al.
patent: 4926462 (1990-05-01), Ladd et al.
patent: 5313459 (1994-05-01), Matern
patent: 5369695 (1994-11-01), Chakravarti et al.
patent: 5416834 (1995-05-01), Bales et al.
patent: 5521970 (1996-05-01), Herrick et al.

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