... handsets Multi-channel auto scan Maximum handsets: 100, with intercom function Two line PBX systemFull duplex talk between ... handsetsMulti-channel auto scanMaximum handsets: 100, with intercom function LCD panel, with alarm timing MCU control, 100,000 duplex ... Ringer volume and intercom volume can be changed, with several ring selections intercom CIDStoring 10 sets of numbers for quick ...