I have NEC -9100 system and I have an extension that will go to voice mail if an outside call comes in but will not when dialing ext- ext.

SOURCE: Will Not go to voice mail

Jennifer209, if you press FEATURE + the button VM is pre-programmed on what does it display? It should show the extension number pilot to VM. If you call it directly, what happens? If you get no answer calling it directly, your VM may be down.

Kaait, is it getting into the VM that's the problem, or doing things inside the mailbox that is the problem?

SOURCE: can not access the voice mail. can not leave voice mail.

Just need to power off and on the system.

SOURCE: Message light blinking. LCD has myext-voicemail#

I received a voice mail which seemed to correct the problem. Sort of the same solution as when an actual extension is displayed. (you connect/disconnect)

SOURCE: NEC DTU-16 D phone voice mail locked up

Cleared voicmail on all other extensions and waited, it eventually (3hrs later) cleared itself

SOURCE: Inter-Tel Axxes phone outside calls don't go to voice mail

I had this same challenge with an InterTel 5000 system. Outside calls going right to the receptionist. My solution: You cannot fix this from a phone, you must open the DB Session Manager, move to Call Routing Tables (this is right above Voice Processor) and move all of your extensions above the "NO MATCH" and "EMPTY" lines on the bottom. Anything below those two lines will bypass the extension and go straight to the main attendant. At least in my configuration it does. See below...
By just moving that last extension "5059" above the "NO MATCH" line, calls will now go to the extension from an outside caller. The trick is to hold your mouse on the pen icon and click several times to activate that line, then you can drag it to where you want. See below...

Hope this helps someone?

vandata1