Key telephone system for residential and small commercial offices comprising asymmetric digital subscriber line router, voice over Internet protocol devices, LAN switch, telephone exchanger, automatic Internet protocol private branch exchange, and automatic private branch exchange

'asymmetr':11 'automat':25,32 'branch':29,34 'commerci':8 'compris':10 'devic':20 'digit':12 'exchang':24,30,35 'internet':18,26 'key':1 'lan':21 'line':14 'offic':9 'privat':28,33 'protocol':19,27 'residenti':5 'router':15 'small':7 'subscrib':13 'switch':22 'system':3 'telephon':2,23 'voic':16

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