Phone numbers can be connected to voice apps in the settings for each number, on the Phone numbers page.
Menus and announcements can forward calls onwards to both SIP-addresses and other destinations – such as phone numbers, Users and other Voice apps.
Prompts to be played to the callers can be uploaded, recorded over the phone or be created using Text to speech.
This video explains how a voice menu can be created.
More information about Voice apps can be found in the Help section of our main site.