For the users to be able to do this from the phone or by calling into the system the users will have to have pre-recorded greeting for different status and switch between them from the phone or by calling in to the system. They can do that from the web client, windows client or an android client.
In order to manage Auto Attendant's PIN, once in Auto Attendant tab, click on the Auto Attendant you wish to manage. Go to Settings and the PIN will be at the bottom of the General section. Uploading greeting from HostPilot: Record and save your greeting using any sound recording program (read the Knowledge Base article on How do I create a *.WAV or *.OGG file for my greeting? for more information). The file must be in WAV or OGG format and cannot be larger than 16 MB. Then navigate to Services > Unite > Auto Attendants > click on Auto Attendant Name > Business Hours > click on a menu you wish to change the greeting for. Under the menu options, click on the current greeting name, then choose file, specify the file name and agree with policies and limitations, then click Upload.

You can have several multi-level Auto Attendants with different local and/or toll-free numbers assigned.
A professional voicemail greeting is essential in many aspects of a business. In sales, it enables you to properly respond to inquiries from prospects and customers or discuss a deal in more detail. When they call, and you can’t answer, you may lose the opportunity for immediate communication and potentially lose a client or customer.