(EC=Echo Cancellation/Canceller)
I've just tested octasis EC with a 4 BRI and 2 BRI.
I've learned from a problem i had that those card have onboard hardware
for EC and they use the hardware EC by the default.
Octasis seems to be a good stuff but onto a VIA 700Mhz cpu 1 channells
eats 10-15% (i dunno if it scale linear or not since i've registered
only 1 license onto the test machine).
However it uses too much cpu, require a patched driver (so every change
into the mISDN driver require a backport i suspect).
So i'm just evalutating to use the hardware EC and to use it better.
I've found inside /mISDN-1_1_4/drivers/isdn/hardware/mISDN/dsp.h that
there are some options that can be tuned.
For example defining the AGGRESSIVE_SUPPRESSOR will help ?
And wich of those 3 EC is the best?
//#include "dsp_mec2.h"
//#include "dsp_kb1ec.h"
#include "dsp_mg2ec.h"
ATM i'm very happy about the beronet 4 BRI cards, i've no problem with
them. I've some harsh echo with the stupid 1 BRI HFCI cheap cards: they
have regular echo when calling PSTN number. Well: you just hear your
voice returning back with i think 100-200ms (would be nice if there is a
tool to record it and analize the exact timing).
How to solve this? Raising echocancel=X ?
Cordiali saluti,
Antonio Gallo
Direzione R & D
MC srl
Via al Lago, 6/a
23900 Lecco
Tel. 0341.423318
Fax. 0341.424828
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