Frequently Asked Questions

Recovering Lost Security Codes

The RFC-1/B has four security codes: main access, control access, basic programming and advanced programming. There is a command to read, and optionally reprogram, each security code. These commands can be used to recover the security codes if they are forgotten or unknown to a new engineer.

The commands are:

  • 72: main security code
  • 73: control security code
  • 74: basic programming security code
  • 75: advanced programming security code

There is one condition. These commands only work from the local phone. If you have a key to the building, you have access to the system security codes. The system will return an error if these commands are issued from a dial-up connection

The value 10 represents an unused digit in a security code. For instance, the main security code can be up to eight digits long. If a six digit code is used, the final two values will be 10. The value 10 is programmed using the star (*) key. Unused digits are placed at the end of the code.


Assume that an RFC-1/B has all the factory settings and you want to change the main security code.

  1. Pick up the local phone and press the local control button to gain local access.
  2. Enter the command 72
  3. The RFC-1 responds, "main security code" followed by eight digits.
  4. After the final digit it says, "push pound to reprogram".
  5. Press the pound (#) key.
  6. The RFC-1 responds, "enter 8-digit security code".
  7. Enter the digits for the code. Fill unused places with the star (*) key.
  8. When eight keys have been pressed the RFC-1 responds, "OK".

The process is complete. The new code is programmed.

When the commands 72-75 are issued, the corresponding code is read and the command terminates at normal operating mode. Nothing changes unless the # key is pressed at the prompt.