An address-of-record (AOR) is a SIP or SIPS URI that points to a domain with a location service that can map the URI to another URI where the user might be available. Typically, the location service is populated through registrations. An AOR is frequently thought of as the "public address" of the user.
The Peeredge Switch SBC maintains AORs for all active SIP Registered Trunks and all active SIP Registered Phones (when Phone Proxy Mode is enabled).