In an adapter for interfacing between {HEAD ~ a telephone central office} and {TAIL ~ a private branch exchange} where said PBX also interfaces with a plurality of telephone extensions and with a voice message system, the method comprising the steps of 
In an adapter for interfacing between { HEAD ~ a telephone central office } and { TAIL ~ a private branch exchange } where said PBX also interfaces with a plurality of telephone extensions and with a voice message system , the method comprising the steps of
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