What is an ANAC?
ANAC stands for Automatic Number Anouncement Circuit. This is a phone number you can call that will ring into a circuit that anounces the ANI or CPN number you are calling from. An example of an ANAC is 800-555-1140 and 800-555-1180. When you call this number you will get an ARU(Audio Response Unit) this is the circuit that anounces your ANI/CPN. When you call 800-555-1140 or 800-555-1180 the ARU will give you this information: “The ARU ID is [id], Your line number is [trunk number], the DNIS is [DNIS number] the ANI is [II digits followed by CPN, even though the recording claims to be reading ANI]” (These ANACs don’t work anymore, try 800-444-4444) ARU ID: Audio Response Unit ID number, this identifies which ARU in a group of ARUs you reached. Line number: The trunk you came in on. DNIS: Dialed Number Identification Service — Tells you which number YOU called.(i.e. 800-555-1140 is 03123, 800-555-1180 is 03125) ANI: II digits followed by ANI.
