oleg, that probably would work, if placed in the correct place. And herein lies the problem — as much as I've worked with these I still can't remember where stuff like this should go. For the phone port alone, you have DigitMap, OutboundCallRoute, and CallReturnDigitMaps. For each service provider you have an X_InboundCallRoute (okay, I get that this one is for incoming calls, but it might confuse some), and then in each ITSP Profile, under the General settings there is a DigitMap. It gets a little confusing at times to remember what goes where. At times I wish there were a "dummy's guide" to this stuff because even though I've been around things like this for many years, I still get confused about what goes where.
Don't get me wrong, I do appreciate that we have all this configurability, but with great configurability comes great responsibility (or something like that). It would be really nice if there were a guide or a sticky post or something that explains how these fields interact, in simple terms.
And that's why I suggested it for the portal. Most folks would likely rather enter a comma-separated list of local area codes than to try and figure out where to insert a string like that (which would require using the Expert Configuration, which itself would probably scare a few users). But having said that, I'm pretty sure your Digit Map addition would work, if inserted in the correct place. Thanks!