Yes, you can edit it... We had to do it at a site that had more than 3 access numbers (several international numbers) and we had to add them manually into the template file, but any upgrade will over-write the file. It's been a while since we did it, can't find my notes. If you open a ticket with support they can tell you the template file you need to edit. (Sorry, thought I had the info here, but after 30 minutes of searching I can't find it)