in this project, we demonstrate the 4 line telephone PBX systems with full signaling and switching functions similar to those of the central office systems PBX. It's Not Virtual PBX .Dial tone, busy tone, and ring tone are provided during call progress. Ringing is generated at the receiving end of the phone being called. Switching employs integrated circuit (IC) matrix switches on four buses. Thus, this PBX system is expandable to 8 lines (4 pairs) if more hardware is added. This PBX system is switching on the Dual Tone Multi Frequency (DTMF) dialing signal and does not work with pulse dialing signal founded in some older phones.in Virtual PBX, we use IP telephone System. But it's difficult, if we make own.
Schematics visit this site
Wednesday, April 26, 2006
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