Echo cancellation?

quick question: what echo cancellation is being used? Mark2? OSLEC?

Hi

MG2 is compiled in, but if you want to change it, then edit the appropriate lines in /usr/src/zaptel/zconfig.h then recompile zaptel.

make clean
./configure
make
make install

Yours

Joe

MG2 is a good start - is there any plan to add OSLEC? I've been using it for several months in 3 different production machines and have been extremely happy with the results.

actually no. comment the
#define ECHO_CAN_MG2
and uncomment another one
(make clean, make)
and zaptel.ko still reports

Zaptel Echo Canceller: MG2

What can I say: -

http://kb.digium.com/entry/1/

tried oslec, tried (just for fun) JP1


It only actually compiled in when I changed this line in Makefile.kernel26

(from) ECHO_CAN_NAME := MG2
(to) ECHO_CAN_NAME := OSLEC

We'll see if the echo goes away...

Oh and then there's this humorous error

zaptel: no version for "oslec_echo_can_traintap" found: kernel tainted

(Run! it's the PLAGUE...!)

Hi

Have you tried fxotune -i 4, assuming you have a TDM400P or similar. Stop asterisk first before running it.

I've had good results with Digium's HPEC echo canceller, on a variety of different hardware, and it's free with a TDM400P

Joe

no I haven't got any internal fxo equipment installed. I've got a Linksys PAP2T ata. our cordless phone has severe echo on it, sometimes. I'm loading ztdummy. If echo canceling isn't even supposed to work in that configuration, I guess I'll be finding out soon...

Preliminary Results: success but not perfection. The echos are much fainter and conversation is much more pleasant

HPEC Channel Numbers:

With a TDM400P with 3 FXS ports and one FXO port do you need to be four licenses for the card? (I've had the card for about 2 years and don't qualify for a freebe).

Is echo cancellation invoked on all calls? Both via SIP and analog calls to the PSTN?

Hi

It's a function of Zaptel, so it only works on Zaptel channels.

I'd suspect that you would need 4 licenses.

You could try Oslec.

Joe