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Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an Asynchronous Transfer Mode (ATM) network.[1] In ATM, the voice traffic is encapsulated using AAL1/AAL2 ATM packets.[2] VoATM over DSL is a similar service, which is used to carry packetized voice signals over a DSL connection.[1]



VoATM is a multi-service, high speed, scalable technology but rarely found because of its expensive services.[3]


Prioritization is implemented through QoS parameters.[3]


Fragmentation is built into ATM with its small, fixed-sized, 53-byte cells.[3][4]

Variable delay[edit]

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.[3]

Echo cancellation[edit]

VoATM transports data, voice, and video at very high speed. The same method for echo cancellation is employed.[3]

See also[edit]

Professional wide band audio over ATM. Audio Engineering Society AES47


  1. ^ a b Tamara Dean. Network+ Guide to Networks. Course Technology, Cenage Learning, 2010, p. 533.
  2. ^ Cisco [1], Voice over ATM (VoATM)
  3. ^ a b c d e Ahmed, Fatima. [2], developer.com, November 24, 2003, accessed April 26, 2011.
  4. ^ AAL Types [3], accessed April 26, 2011