In {HEAD ~ an adapter} for interfacing between 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 
for interfacing between
In { HEAD ~ an adapter } for interfacing between 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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