Call progress tone generation in a communication system

Details Call progress tone generation in a communication system Call progress tone generation in a communication system

2006-05-23

2006-05-23

Matar, Ahmad F. (Department: 2642)

Telephonic communications

Centralized switching system

With generating of call associated substation signal

C379S165000, C379S353000, C379S221080

Reexamination Certificate

active

07050564

ABSTRACT:
A communication system is disclosed that generates call progress tones for a call. The communication system is comprised of a calling device and an originating system. Examples of the calling device include a telephone, a cellular phone, a computer, and a fax machine. To place a call, the calling device transmits set up messages to the originating system. The originating system transmits set up messages to a terminating system to set up the call. The originating system receives acknowledgment message from the terminating system in response to the set up messages. The originating system generates a call progress message and transmits the call progress message to the calling device. The calling device generates a call progress tone based on the call progress message and plays audible sounds that represent the call progress tone. By having the calling device generate the call progress tones, the originating system is advantageously available for other communications.

REFERENCES:
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patent: 5359598 (1994-10-01), Steagall et al.
patent: 5436964 (1995-07-01), Halligan
patent: 5473630 (1995-12-01), Penzias et al.
patent: 5818921 (1998-10-01), Vander Meiden et al.
patent: 5937035 (1999-08-01), Andruska et al.

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