PC software based Private Branch Exchange (PBX) program which avoids the use of in-house hardware switching equipment by utilizing Central Office (CO) switches at the carrier by manipulating "Call Transfer" or "Conference Call" subscription services to gain access to the CO switches; provides for the creation of unlimited extensions to any separate telephone line, thus simulating (or Virtualizing) the use of extensions without an actual PBX hardware switching system

'access':40 'actual':67 'avoid':10 'base':3 'branch':5 'call':31,35 'carrier':28 'central':22 'co':24,43 'confer':34 'creation':48 'equip':19 'exchang':6 'extens':51,64 'gain':39 'hardwar':17,69 'hous':16 'in-hous':14 'line':56 'manipul':30 'offic':23 'pbx':7,68 'pc':1 'privat':4 'program':8 'provid':45 'separ':54 'servic':37 'simul':58 'softwar':2 'subscript':36 'switch':18,25,44,70 'system':71 'telephon':55 'thus':57 'transfer':32 'unlimit':50 'use':12,62 'util':21 'virtual':60 'without':65

VIRTUAL PBX

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