VoATM
# VoATM

Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an Asynchronous Transfer Mode (ATM) network. In ATM, the voice traffic is encapsulated using AAL1/AAL2 ATM packets. VoATM over DSL is a similar service, which is used to carry packetized voice signals over a DSL connection.

## Protocols

* ATM Adaptation Layer 1 (AAL1)
* ATM Adaptation Layer 2 (AAL2)

## Deployment

VoATM is a multi-service, high speed, scalable technology but rarely found because of its expensive services.

## Prioritization

Prioritization is implemented through QoS parameters.

## Fragmentation

Fragmentation is built into ATM with its small, fixed-sized, 53-byte cells.

## Variable delay

Dynamic Bandwidth Circuit Emulation Service (DBCES) does not send a constant bit stream of cells but transmit only at an active voice call, reducing delays and variations.

## Echo cancellation

VoATM transports data, voice, and video at very high speed. The same method for echo cancellation is employed.

