That’s the “A” within the acronym — it means automated. In distinction, common PBX systems have to have human switchboard operators to manually connect cellular phone customers. Avaya is finest for large enterprises. They've got a historical past of making PBX solutions, so their reliability makes them a safe preference. https://businessmindsettraining06059.theobloggers.com/41705348/everything-about-pabx-systems