- ADNOS - The Advanced Dynamic Number Overlay System: A system for creating number overlays on demand via API calls.
- Advertiser: Any person or system capable of generating overlays which is of particular interest to an ADNOS user.
- Announcement: A sound clip which can be played to the caller and/or callee at the start of an overlaid call.
- CLI - Calling Line Identification: The phone number of the person making a call.
- DDI - Dialed Destination Identification: The phone number of the person receiving a call.
- DNI - Dialed Number Identification: The phone number dialled to make a call.
- Overlay (verb): The act of connecting two numbers such that calls made by dialing one number (the DNI) are routed to the other (the DDI).
- Overlay (noun): The connection between two numbers created by this act.