Integrated voice mail system for CDMA network

Details Integrated voice mail system for CDMA network Integrated voice mail system for CDMA network

1997-02-26

2000-05-30

Patel, Ajit

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370428, 379 8822, 379212, 379214, 379230, 379 8825, H04B 7216

Patent

active

060698888

ABSTRACT:
A voice mail system is provided in a CDMA wireless telephone system in which a base station controller (BSC) stores, in a encoded format, voice data transmitted by a wireless telephone to a receiving telephone, either wireless or fixed telephone, when the receiving telephone does not "pick up". Also, the base station controller encodes and then stores voice data that is transmitted by a fixed telephone to a wireless telephone when the wireless telephone does not "pick up". In either case, to retrieve voice mail the intended recipient can access the voice mail from a fixed telephone, in which case the voice mail is decoded at the BSC and then sent to the fixed telephone via a landline. Alternatively, the intended recipient can access the voice mail from a wireless telephone in the system, in which case the voice mail is not decoded at the BSC, but is transmitted directly to the wireless telephone, where the message is decoded. In any case, the voice mail undergoes only a single encoding/decoding process, thereby improving the sound quality of the retrieved voice mail messages compared to systems in which tandem vocoding occurs.

REFERENCES:
patent: 5134647 (1992-07-01), Pugh et al.
patent: 5423079 (1995-06-01), Namiki et al.
patent: 5751794 (1998-05-01), Kugell et al.
Yasuda, et al. "Network Functions for the Application of Multi-rate Speech Coding in Digital Cellular Systems" IEEE 1(conf 44): 306-310 (Jun. 8, 1994).
Uebayashi, et al. "Development of TDMA Cellular Base Station Equipment" IEEE 1(conf 42): 566-569 (May 10, 1992).

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