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The Digium VPM032 echo cancellation module is compatible with A4-series analog cards. When Asterisk is connected to a PSTN, voice echo is possible. While software-based solutions are available, they aren't always effective. This echo cancellation unit attaches to the FXO / FXS card and provides an effective means of improving voice quality.
Note: compatible with 4-port A4A and 4-port A4B cards.
