供应二总线消防电话主机（总线消防通讯主机）
1,20/100门总线电话，布线只需二根且不分极性
2,主分互叫；分机摘机即通话，主机显号
3,可三方通话，尺寸2U
4,通话时自动启动20分钟以上的数字录音
5,呼叫、应答时间记录，液晶屏显示100条信息

2-Bus Fire Control Telephone Host
1, Only a twisted-pair wire without polarity is needed.
2,A total of 20/ 100 extensions can be provided for the main phone.
3, Each extension can call the main phone without dialing. And the main
phone can call any of the fitted extension too. What’s more, the extension number displays when it is calling.
4,Permits the second extension to call when the main phone is communicating with a different extension.
5,The systems can start more than 20 minutes of digital recording when communicating.
6,Call and response time was recorded；LCD screen can display 100 pieces of information