I have an MP-114 FXS_FXO. I have set it up exactly as specified in the documentation, except the documentation has four ports of FXO instead of 2 FXS and 2 FXO. Could that be the reason it doesn't work? Here is what I am getting: :[CM102001]: Authentication failed for SipReq: REGISTER 192.168.0.136:5060 tid=ac461317046 cseq=REGISTER email@example.com / 788 from(wire); Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings Of course I have set the authorization IDs and Passwords to be the same in both. I am running the latest version of 3CX and have flashed the latest BIOS in the 114. Any ideas?