SMS switching private branch exchange system and method

Details SMS switching private branch exchange system and method SMS switching private branch exchange system and method

2008-04-01

2008-04-01

Tsang, Fan (Department: 2614)

Telephonic communications

Audio message storage, retrieval, or synthesis

Digital signal processing

C379S088140, C379S198000, C379S258000, C455S412100

Reexamination Certificate

active

07352849

ABSTRACT:
An short message service switching private branch exchange system and a method can reduce costs. The method can include certifying whether a usable DSP exists or not when an office line and a speech path are connected to each other, and transmitting an short message service signal transmitted from the office line to the DSP through a PCM channel if the usable DSP exists. A main processor of the private branch exchange can certify an extension line terminal that will receive short message service, generate an short message service signal having a format corresponding to a kind of the extension line terminal by using the DSP, and transmit the formatted SMS signal to an extension line interface unit of a corresponding extension line terminal. The system switches an SMS signal between an office line and an extension line by sharing the DSP, for example, by time division.

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“Access and Terminals (AT); Short Message Service (SMS) for PSTN/ISDN; Short Message Communication between a fixed network Short Message Terminal Equipment and a Short Message Service Centre;” ETSI ES 201 912 (V1.1.1) (Jan. 2002), pp. 2-88, dated 2002.

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