Avaya 3905 User Manual page 22

Your telephone's controls
Context Sensitive Soft Keys. In this configuration, you will only see it appear
when you go off hook. In addition, it will only dial your voice mailbox when you
have a message waiting. As an alternative, a Message Key may be
configured as a Programmable Line/Feature Key (self-labeled). This
configuration allows you to dial your voice mailbox whether or not you have a
message waiting.
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