AsteriskNOW is set up on a server. The entire network (including phones) is connected to the firewall and then to a Bell router. The entire system was working flawlessly with an old number, but incoming calls stopped working when the main number was ported over to a new number.
Outgoing calls are normal and working. Internal extension-to-extension calls work fine. Incoming calls are not connecting to Asterisk. The ISP says that Asterisk is returning a 404 error.
I'll post config files and CLI output if necessary.