I tried to find an existing thread with this info. I upgraded a CPC-S to a CPC-M and cleared the RAM. The CPC-S was setup to answer a ringing line without pressing the FF button. I turned on ringing line (FF3 option 12=1) on all extensions but only #1 (EXT 100) is working. Is another step besides enabling the feature at all the extensions needed? I had no problem programming pageing group etc. What am I missing?