Digium TE800 Series, User Manual

Page: 43 / 75

Chapter 3: Configuration
Users of open source Asterisk-based echo cancelers also have the
following options:
echocancel = 128 (this sets 128 taps or 16ms)
or
echocancel = 256 (this sets 256 taps or 32ms)
Audio quality issues may result from choosing a taps length greater than
the server's ability to process the echo in real-time. If audio quality is
affected, reduce the taps length or combine your TE800 Series card with
Digium's VPMOCT256.
Users of Digium's VPMOCT256 hardware echo cancellation module will
have 128ms of echo cancellation performed at all times unless explicitly
disabled by setting the echocancel variable equal to "no."
Digium, Inc. Page 43