How can I manually program what is dialed automatically when pushing the "messages" button on an AAstra 6739i

I have my AAstra 6739i working fine. The Messages light comes on if I have messages, it goes off after listening to them. But when I click the Messages button, it doesn’t dial anything automatically. It needs to dial #98 for MyVoiceMail but does nothing. Where can I program that to happen.

What version of FreePBX and how was the phone provisioned?

I just realized it was being provisioned by the web interface, so I set it back to factory and now it is provisioned by endpoint manager and it “messages” dials correctly.
Thanks for your response.

I just realized it was being provisioned by the web interface, so I set it back to factory and now it is provisioned by endpoint manager and it “messages” dials correctly.
Thanks for your response.