That site I mentioned that has 99% out of town customers, 91 is in fact what I entered in the prefix field.
Sadly, no, we cannot dial the 1 first for local calls, the PSTN will refuse to route the call and provide the caller with an error message.
I will experiment with using shortcodes to strip the 1 for local though - it had occured to me just no time to test it lately. Also for some reason it "feels" like although this would work for user dialed calls it won't for Phone Manager or redial from call log stuff. Silly I know - I should try it and find out.
Peter