Avaya Support Avaya Partner Avaya Administrative Codes | Programming Codes System Support and Replacement Avaya Handsets or call 1-877-272-8292 Replacement Phones – Onsite Support – Line System Upgrades   Use the following procedure to Enter System Administration mode From extension 10 or 11 with a display, press FEATURE 00 PROGRAM EXTENSION 10 Press the LEFT intercom button twice SYSTEM […]