What type of DNS record is used to contain Address of Record (AOR) information?

The type of DNS record used to contain Address of Record (AOR) information is represented by the NAPTR (Naming Authority Pointer) record. NAPTR records are specifically designed to facilitate the mapping of phone numbers or other types of user identifiers to URLs or various other resource records. In the context of SIP (Session Initiation Protocol) and VoIP (Voice over Internet Protocol), AORs are commonly utilized to identify users or endpoints in a communication system.

NAPTR records enable service providers to define how user identifiers resolve to different protocols or services through a flexible mechanism that allows for various application-layer protocols, including SIP. This capability makes them essential for managing and directing SIP communications based on AOR information.

The other types of DNS records, such as SRV (Service), MX (Mail Exchange), and TXT records, serve different purposes. SRV records are used to specify the location of servers for specific services, MX records are specifically for email routing, and TXT records can hold arbitrary text information, but none of these fundamentally serve to handle AOR information in the same way that NAPTR records do.