Generally, there are a few paging codes that work on certain brands of phones. Many brands use pre-set paging codes for their systems, unless the systems are super-programmed or custom-made and programmed (Home Depot).
Otherwise, these are the set paging codes:
Avaya/Lucent: 70
Mitel: **9 or 60
Toshiba: #30 or #39 (#39 is the over-ride/emergency code, which will interrupt a page, and nobody can page over you!)
Comdial: 89
Nortel: Feature then 630
Panasonic: 339 or 33*
Bizfon: 249
Samsung: 559
Iwatsu: 8
If anyone would like pictures of these brands, please post a message, and I will post photos!
Many stores use cheapo analog "home" telephones for asile phones and phones that don't get used much. To find out information on these phones, you have to look at what kinds of phones they have behind counters, at customer service, etc. Usually these will be black in color with a display and lots of buttons.
On Office Max phones, they are usually Toshiba, so #39 would work. Office Depot usually has "InterTel" Phones, and the Page button is a proprietery (sp) button marked on the phone. Wal*Mart has #96. Circuit City has 50.
I don't know what the code for Best Buy or Target is. The Target around here has the bright red phones, and it seems like they Page with a big microphone on the Customer Service counter. The employees communicate on their two-way radios. The Best Buys around here just switched their phones to Cisco IP phones, and I haven't had a chance to take a look at them yet. Some grocery stores/supermarkets (usually the smaller ones) use Aiphone systems, with the white handsets with four buttons on the base and a button on the inside of the corded handset, right under where your ear goes, that you hold and page with. These phones are not actual phones, just a glorified intercom system like some people have in their house, so there is no way to call out or dial an internal extension.
Other chains around here include Kohls, which use a variety of phones and Woodmans, which mainly uses Samsung phones. Shopko uses Mitel, but I haven't been able to figure out how to page on them, mainly because of the Indyme system (the system where you push the button and it announces "Customer Service, to ____________ department.). Fleet Farm/Farm and Fleet uses Mitel and you simply press 60, and speak after the short beep. Menards (Midwestern home improvement store) has a Samsung system, where you dial 559, you will hear a short beep/buzz over the intercom and then you talk.
I hope this information has been helpful, and please use it only in situations that are appropriate and not against the law...or at least I wouldn't!
Have a good day!