Zycoo 4FXS module with 4 FXS interface (U50/100

4FXS module applies to CooVox-U50/U100V1,U80,U50/U100V2 IP Phone System . 4 RJ11 ports configured as FXS, interface that connect to a station. One FXS channel is required for each telephone connected to Asterisk system The loop start Analog Interface(FXS) provides the following features: •Detects ringing when on-hook •Detects loop current when off-hook •Detects when tip/ring...