Hello, I am having problems configuring a TDM400P 4 Port FXO card with groundstart signalling. The box has 2 X100P's, 1 TDM04B and 1 TDM40B. I can configure it for loopstart and it works, just not groundstart, which I need for this installation. What am I missing? Thanks! Mark /etc/zaptel.conf #two X100P FXO Cards # fxsls=1-2 # TDM400P 4 Port FXO (TDM04B) fxsgs=3-6 # TDM400P 4 Port FXS (TDM40B) fxoks=7-10 [root@pbx etc]# ztcfg -vvv Zaptel Configuration ===================== Channel map: Channel 01: FXS Loopstart (Default) (Slaves: 01) Channel 02: FXS Loopstart (Default) (Slaves: 02) Channel 03: FXS Groundstart (Default) (Slaves: 03) Channel 04: FXS Groundstart (Default) (Slaves: 04) Channel 05: FXS Groundstart (Default) (Slaves: 05) Channel 06: FXS Groundstart (Default) (Slaves: 06) Channel 07: FXO Kewlstart (Default) (Slaves: 07) Channel 08: FXO Kewlstart (Default) (Slaves: 08) Channel 09: FXO Kewlstart (Default) (Slaves: 09) Channel 10: FXO Kewlstart (Default) (Slaves: 10) 10 channels configured. ZT_CHANCONFIG failed on channel 3: Invalid argument (22) Did you forget that FXS interfaces are configured with FXO signalling and that FXO interfaces use FXS signalling? [root@pbx etc]#