应用-企业交换Private Brance eXchange
用途: PBX systems are private local telephone systems that are used to provide telephone service within a building or group of buildings in a small geographic area. PBX systems contain small switches and advanced call processing features such as speed dialing, call transfer, and voice mail. PBX systems connect local telephones ("stations") with each other and to the public switched telephone network (PSTN).
This diagram shows a private branch exchange (PBX) system. This diagram shows a PBX with telephone sets, voice mail system, and trunk connections to PSTN. The PBX switches calls between telephone sets and also provides them switched access to the PSTN. The voice mail depends on the PBX to switch all calls needing access to it along with the appropriate information to process the call.
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