Specifications

Digium, Inc.
The 800 Series cards, unless otherwise equipped, utilize Aste
perform software-based echo cancellation. Asterisk mainta
of open source echo cancelers. These open source echo ca
a moderate level of echo cancellation, but are not capable of
higher levels of, or more advanced, echoes.
Digium recommends that those users concerned about echo
purchase the VPMADT032 hardware echo cancellation m
VPMADT032 may be combined with both the TDM800P
The VPMADT032 is designed to handle up to 128ms of ec
across all channels and provides a G.168 echo cancellation
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