ATM
attendant console
Attention dial (ATD)
Audio Information Exchange (AUDIX)
AUDIX
auto-in trunk group
Auto-In Work mode
Automatic Alternate Routing (AAR)
Automatic Callback (ACB)
Automatic Call Distribution (ACD)
Automatic Call Distribution (ACD) split
Automatic calling unit (ACU)
Automatic Circuit Assurance (ACA)
Automatic Number Identification (ANI)