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ONESTI 1
•PCM uses two compression algorithms:
–Mu-Law (used only in North America and Japan)
–A-Law (the standard for all international circuits)
•G.711 – international standard for encoding voice on a 64-Kbps channel
•Point of presence (POP) – an interexchange carrier that connects long-distance services to a local connection
•Private Branch Exchange (PBX) – enables an organization to create an internal telephone-numbering system
•Direct Inward Dialing (DID) / Direct Dialing
Inward (DDI) – enables multiple telephone numbers to be used on a few lines
•Call blocking – prevents calls from ringing through based on point of origination; also, restricting a station from making outbound or long-distance calls
•Call forwarding – redirects calls from one phone number to a second phone number
•Callback – monitors a busy phone and completes a call to that number when the busy phone goes back on-hook
•Traffic reporting – reports that detail usage on incoming and outgoing trunk groups
•Ringing preferences – programs certain lines to ring only on particular stations
•Automated attendant – answers call, collects station number of desired party, then transfers the call
•Voice mail systems – integrated voice mail
•Outward restrictions – restricts stations to making only intercom or local calls
•Private numbering plans – allow users to call internal extensions without using an outside line
•Unified messaging – stores all forms of messaging, e-mail, voice mail and fax, in a centralized server
–Most-idle line hunting – used to distribute the load over all trunks
–Sequential hunting – hunts in a sequence from the dialed number through to the end of the hunt group
–Circular hunting – hunts all lines in the hunt group before returning a busy signal
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ONESTI 2
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