Echo cancellation feature

Type of feature

Echo cancellation is a base feature.

Overview

Echo cancellation involves the removal of the echo that occurs when a caller speaks or dials during a prompt. In doing so, it facilitates barge-in and talk-off, and also improves the accuracy of speech recognition.

Hardware requirements

Echo cancellation is built into the digital telephony boards.

Software requirements

• The echo cancellation feature requires the NMS package (AVnms). For more information, see NMS package.

Application development considerations

Echo cancellation is controlled by IRAPI calls, including the following:

• irStartEcho starts echo cancellation.
• irStopEcho stops echo cancellation.
• irCheckEcho checks whether echo cancellation is on or off.

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