- The Digium 1VPMOCT256LF is a 256 channel echo cancellation module. For Asterisk users who connect to the PSTN, the most common type of echo is hybrid echo.
- The echo introduced by the impedance mismatch between 2-wire and 4-wire telephone circuits.
- The echo manifests as a distorted and delayed reflection of the users voice while in conversation with an external party through the PSTN.
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