Mobile termination error notification +CMEE

The +CMEE command disables or enables the use of the final result code +CME ERROR. v2.0.x

The following +CME ERROR codes can be received by all commands.

0 – Phone failure. Invalid command, parameter, or other unexpected error.
23 – Memory failure. Unexpected error in memory handling.
50 – Incorrect parameters in a command.
60 – System error.

Other +CME ERROR codes are listed in command descriptions.

For reference, see 3GPP 27.007 Ch. 9.1.