Avaya EC500 User Manual page 42

Appendix: Other EC500 Uses
8. If you have another EC500 extension you want to enable or disable (for
example, to enable/disable call waiting), repeat this procedure in its entirety
and enter that extension number in Step 3 and the associated Station
Security Code in Step 5.
NOTE:
If you do not receive a confirmation tone in Step 7, hang up, verify the codes
entered and repeat the procedure from Step 1. If you still do not receive a
confirmation tone, contact your System Administrator for assistance.
A-4 Issue 3 August 2002