You can set the VM Greeting under the Notification Bell, additional details here.


By selecting the Use System Voicemail Settings box under Voicemail Options for a user or group, you are electing to use the universal voicemail setup for the entire account.

1.  To configure the system voicemail go to Settings>System>Voicemail Options.  

 

Note: You may need to contact your Account Rep for assistance with this feature