Here are a list of extensions that I have managed to keep on hand.
Administration - 2280
Best Buy for Business/Home - 2200, 2205 (Cordless)
Car-Fi - 2150, 2151 (Cordless), 2240 (Installation), 2241 (Cordless Installation)
Computers - 2202, 2201 (Cordless)
Digital Cameras - 2130, 2131 (Cordless)
Geek Squad - 2206, 2204 (Cordless), 2110 (Front Desk), 2111 (Front Desk Cordless)
Home Theatre - 2170, 2171 (Cordless), 2172 (Secondary Cordless)
Inventory - 2220, 2223 (Cordless)
Loss Prevention - 2180, 2181 (Cordless)
Media (Gaming, Movies, CDs...) - 2260, 2261 (Cordless), 2262 (Secondary Cordless)
Merchandising - 2222
Manager on Duty (MOD) - 2020, 2021 (Cordless)
Rep II (Customer Service) - 2100, 2090 (Cordless), 2091 (Secondary Cordless)
Tills (11-17) - 2250, 2252, 2254, 2251, 2253
Wireless (Mobile Phones) - 2270, 2271 (Cordless)
These of course vary from store to store. However, it is my understanding that they work in any store.
