First off, there are many ways to dial 310 calls in Edmonton.
As you may have noticed, you can dial 310 calls as 7 digits, prefixed with a toll digit. Normal Edmonton 7-digit numbers can be dialed as "0+NXX-XXXX". However, as far as I know, 310 is the only exchange that can be dialed with a 1+, as in "1+310-XXXX". It seems silly to me to allow such a permissive dialing plan. I would think that Telus would incur additional costs by both having to strip the toll digit to place the call, and allowing both seven and ten-digit dialing formats. Oh well, I guess it's their money, not mine.
As far as I can tell, 310 exchanges are unified within a province. So, 403-310-1010 and 780-310-1010 would both be owned by Pizza Hut, for example. This leads to some interesting situations when dialing 310 numbers prefaced with an NPA other than your own. For example, I could dial "1+403-310-1010", and I would be greeted with a recording telling me "Your local call is proceeding. There is no need to dial long distance. Thank you from Telus." Then, I'd get a Not-In-Service recording.
Dialing 310 numbers through Carrier Access codes also yeild interesting results. Attempting to dial something such as "1010323-1-780-310-2345" will result in your call being intercepted at the thousands block, and a " Your local call is proceeding" message, followed by a Cannot-Be-Completed-As-Dialed message. Similarly, dialing "1010323-0-310-0000" will result in a "Your local call is proceeding" message, followed by a Not-In-Service message. Both of those dial strings would work if not dialed through a CAC. I'm pretty sure that it was intentional that 310 stuff not be dialable through CACs.
Calls do not route properly to 310 destinations outside of the caller's province. I live in Alberta, if I wanted to call, say, 310 in Ontario, my call would not complete properly. Typically, I would get a tandem intercept of some sort when attempting to call a 310 number outside of my province. There seems to be a few patterns when dialing 310 numbers in provinces other than mine. When calling an NPA that is part of an overlay, using Bell as your long-distance carrier, one NPA in the overlay seems to intercept locally, and the other NPA generally intercepts remotely. Also, when I get a local “Cannot Be Completed As Dialed” intercept when calling through 1010323-1+, I will usually get a 780-7 intercept when calling through 1010323-0+.
I'll post a link later to the results of me placing a call to every 310 exchange in each NPA across Canada.
Edited by unity, 09 September 2006 - 06:36 PM.