000			00426nam a2200145Ia 4500
008			241226s9999 xx 000 0 und d
020			_a81-7808-258-6
082			_a006.7 _bHER
100			_aHersent, O
245		0	_aIp telephony packet-based multimedia communication systems
260			_aNew York : _bAddison Wesley, _c2000.
300			_axviii,456
365			_a395
650			_aComputer EngineeringInformation Technology
999			_c133916 _d133916