Andrew Kohlsmith wrote:
On Thursday 15 June 2006 10:22, Warren wrote:
I was just told that for my forthcoming system I will be getting a data
T-1 instead of a voice T-1. Given that all of the handsets will be voip
phones, no analog at all, do I need echo cancellation? I looked at the
voip-info wiki and it seems to me that the answer should be "no" but I
would like to confirm that.
All-digital setups do not *generate* echo since there is no hybrid circuit to
reflect energy. However all-digital systems can still have echo if the
far-side is a 2-wire system and the latency is sufficiently high. (Anything
with a PCI bus can bring this latency up easily.)
Also, if you have an ueber-cheap phone which acoustically couples the speaker
in the handset with the mic you can introduce echo on your all-digital system
that way. The same goes for cheap speakerphones and/or acoustically "hard"
rooms.
-A.
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So the next question becomes... Is hardware EC necessary or can *
handle it in software? I am looking at some pretty beefy hardware for
my platform, a Dell PE2850 with dual Xeon 3Ghz processors and plenty of
RAM to spare. I am likely starting with a single T-1 PRI line and
expending to 2 within a year, but that would be the max. I am not sure
of how many simultaneous calls that would be, but let's assume I want
to use a b-channel's worth of bandwidth for each, so 23 max to begin
with.
Can * do software echo cancellation for 23 (and eventually 46) calls on
a dual Xeon 3.0Ghz system?
W
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