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Steve Underwood wrote:<br>
<blockquote cite="mid:49BF942A.3030305@coppice.org" type="cite">
<blockquote type="cite">
<pre wrap="">When there is Echo being generated from the far end, usually in a
bridged call. If you application is just an IVR, with no far end
connectivity, then you shouldn't need an echo can. If you are bridging
calls, then at some point you may need it, depending on what else is
in the loop.
</pre>
</blockquote>
<pre wrap=""><!---->This is VERY VERY WRONG. IVRs badly need echo cancellation. Without it
they give very poor reliability detecting DTMF while the prompts are
playing. If the system uses voice recognition, its reliability will be
even worse.
</pre>
</blockquote>
With respect, this is at best half true. DTMF detection has always
worked just fine <br>
without echo cancellation - the Dialogic, Aculab and Rhetorex cards
which I used <br>
in the late 1990s managed it perfectly well; if the DTMF detection code
in * and FS<br>
can't, then maybe that's something for its author to look at ;-)<br>
<br>
ASR - yes, maybe, but L&H's ASR1500 used to work perfectly well on
the same<br>
hardware above back in the day. I'd be interested to see results of
testing an ASR<br>
engine in with echo; unfortunately, most vendors appear to prohibit the
publication<br>
of test results in their licensing.<br>
<br>
--Dave<br>
<br>
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