Quick Hits:
Check voicemail from outside the district: Call 614-797-7777. You'll need to enter your mailbox number and password.
Voicemail speed dial: x5400
Change voicemail password: Menu 8, 4
Change voicemail greeting: Menu 8, 2
Email notifications for voicemails are going to Spam in Gmail
Set up Call Forwarding (Internal Extensions and External Numbers)
Mitel Phone and Voicemail Quick Start Guide
Mitel 5320 User Manual
Mitel 5340 User Manual