A DID (Direct Inward Dialing) number lets outside callers reach an internal extension directly, without going through a main line or operator. Each employee or department can have its own public number.
DIDs are provisioned in blocks over a SIP trunk or VoIP service, so a business can hand out direct numbers without buying a physical line for each one.
Frontdesk gives you a business number answered by an AI receptionist that picks up every call, qualifies the caller, books the appointment, and logs the whole conversation to your CRM.