If the default security code does not work
it is possible that the code has been changed. Call us with the phone's
serial number to learn how to resolve this issue.
Remove
the mic connector when programming. Depending on the installation
conditions, feedback could be causing the microprocessor to misread the
key tones.
If you have a line powered phone, the provided 9V battery is required to program correctly. Verify that you have at least 7V at the battery.