I'm quickly running out of 3 digit extensions and am planning on moving everyone to 4 digit extensions and I'm trying to figure out how to do this with out breaking an outside callers ability to reach someone. I'm planning on recording our IVR message to include something like "we changed to 4 digit extensions, please put a 3 infront of the old extension" but I'm also hoping there is a way to direct the old 3 digit extensions to the new 4 digit extensions for a short time or if someone dials a 3 digit extension it will play a message saying the extensions have changed and are all now in the 3000 range.
Has anyone out there done a 3 digit to 4 digit switch? how did you deal with telling outside callers of the change?
I'm running Freepbx 184.108.40.206 on Asterisk 220.127.116.11