Try to avoid unnecessary phrases that only make your greeting longer, like “leave your name and number and what you’re calling about.” Most people know what “leave a message” means.
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From the Skype for Business desktop app (if you are running Click-2-Run build C2R 8201.1002 or later), select Set Up Voice Mail. Change your Call Answering Rules You can change what options your callers have when they reach the voicemail service; get disconnected, hear your greeting, record a message, choose to be transferred to the number or user you select. Change your prompt language This is the prompt language that is played to callers. For list of supported languages, see Languages for voicemail greetings and messages from Skype for Business. Configure your Out of Office greeting This is the customized greeting message that is played to callers when your status is Out of Office. This option can be activated "Always," when you have an active "Auto Reply" in Outlook, or whenever you have an out-of-office calendar appointment.  Where you can get your voicemail messages from
Receptionist Group is an option which forwards incoming calls directly to certain users or phone numbers before call goes to Auto Attendant. This group has its own activity periods (weekly schedule). Navigate to HostPilot > Services > Unite > Auto Attendants > Add Receptionist Group. Specify the Receptionist Group Name, Display Name and Ring type. Set up the Receptionist Group Schedule type Set the time frame for the schedule to be active and save changes. Add users/phone numbers and save changes. Further destination of a call depends on the rest of the Auto Attendant options.