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PABX - Intercom Systems

PBX is a system that connects telephone extensions of a company to outside public telephone network as well as to mobile networks. An IP PBX phone system(Internet protocol Private branch exchange) is a PBX that provides audio, video, and instant messaging communication through the TCP/IP protocol stack for its internal network and interconnects its internal network with the Public Switched Telephone Network (PSTN) for telephony communication. ie., An intercom (a short form of intercommunication) is a stand-alone electronic communications system used for limited or private conversation inside a home. Normally, it is an well-known communication system between PA ( Personal assistant) and the officer. There are large intercoms available now a days as well as it can have connectivity with wireless, telephone as well as cellphone.

Intercom is also widely used as door phone which is used to communicate between a person inside home with anyone at the door without having to open the door. This is a typical use of intercom due to rising security concern in city areas.