As a Teams user, if you have the Teams PBX Application installed you will be notified of and can listen to PBX Voicemail without leaving Microsoft Teams.
Instructions
In the Microsoft Teams client app, navigate to the ConnecttoTeams PBX App and ensure you are on the Chat tab.
When you have received new voicemails, you will receive a Microsoft Teams activity feed "Notification" message and a button that says Listen to Voicemail and shows the current number of new voicemail messages.
When the Teams user selects that button this will generate an inbound call to Teams to connect to PBX voicemail.
Depending on your PBX voicemail configuration, you may need to enter a voicemail password.
Note to the Provider and Enterprise Admin
Clicking the "Listen to Voicemail" button sends an INVITE to the PBX with the voicemail access code you have designated on the PBX Settings in ConnecttoTeams.