SMS switching private branch exchange system and method

A method for operating a private branch exchange system, comprising:

• determining whether a digital signal processor of a voice mail interface unit can be detected when an office line and a speech path are connected to each other;
• transmitting a short message service signal transmitted from the office line to the digital signal processor when the digital signal processor is detected as usable;
• determining an extension line terminal that will receive the short message service signal;
• transmitting the short message service signal to the determined extension line terminal from the usable digital signal processor;
• waiting for a prescribed detection time when the digital signal processor is not detected as usable;
• and
• finishing a reception of the short message service signal when the usable digital signal processor becomes usable after the prescribed detection time has elapsed,
• wherein the digital signal processor converts the received short message service signal into short message service data, stores said data in said unit and generates a short message service message of said data corresponding to the extension line terminal according to a main processor, wherein the usable digital signal processor generates another pulse code modulation format short message service signal when the extension line terminal is a single line terminal, and generates the short message service data when the extension line terminal is a digital terminal.

A method for switching short message service of a private branch exchange (PBX) system, comprising:

• switching a pulse code modulation channel of an office line interface unit to a pulse code modulation channel of a digital signal processor of a voice mail interface unit if a speech path is connected to the office line interface unit;
• transmitting a short message service signal to the digital signal processor from the office line interface unit through the pulse code modulation channel;
• decoding the short message service signal transmitted to the digital signal processor to data and storing said data in said unit;
• switching the pulse code modulation channel of the digital signal processor to a channel of a second pulse modulation format of a single line terminal extension line interface unit when an extension line terminal that will receive the short message service signal is a single line terminal;
• and
• switching a short message service data channel of the digital signal processor to a short message service data channel of a digital terminal extension line interface unit when the extension line terminal that will receive the short message service signal is a digital terminal,
• wherein a control unit determines whether a digital signal processor resource of the digital signal processor is available when a speech path is connected, the control unit waiting for a prescribed time until the digital signal processor resource becomes available when the digital signal processor resource is not available, and finishes a reception of the short message service signal when the digital signal processor resource becomes available after the prescribed time has elapsed, wherein the digital signal processor is only a signal digital signal processor of the PBX system.

A private branch exchange (PBX) system, comprising:

• a single digital signal processor of a voice mail interface unit of the PBX system that receives a short message service signal in a first format and converts the short message service signal into a second format short message service signal;
• and
• a controller of the PBX system that controls the digital signal processor and determines the second format,
• wherein the digital signal processor converts the first format short message service signal into the second format short message service signal by converting the first format short message service signal into short message service data, storing said data in said unit and converting the short message service data to the second format short message service signal, the converting the first format short message service signal into the short message service data comprising decoding, converting the short message service data into the second format short message service signal when the short message service data is transmitted to a single line terminal, and outputting the short message service data as is when the short message service data is transmitted to a digital terminal,
• wherein the controller determines whether a digital signal processor resource of the single digital signal processor is available when a speech path is connected, waits for a prescribed time until the digital signal processor resource becomes available when the digital signal processor resource is not available, and finishes a reception of the short message service signal in the first format after the prescribed time has elapsed and the digital signal processor resource becomes available.