This is an edited version of a post that originally appeared on a blog called The Michigan Telephone Blog, which was written by a friend before he decided to stop blogging. It is reposted with his permission. Comments dated before the year 2013 were originally posted to his blog.
This may be of some help to those of you still using “that” software, that are having problems getting a new DID (inbound number) to work. Note this tip might be equally useful for all Asterisk users, or even for administrators of other SIP-based PBX software.
FreePBX: Inbound number not working help (sysadminnet)