[asterisk-users] 11.21.0 : echo woes : can't install canceller

sean darcy seandarcy2 at gmail.com
Thu Jan 28 14:39:43 CST 2016

i've got calls coming into an 11.21.0 box. The internal phones are 
analogue off a TDM400 board, and SIP extensions.

Using an analogue internal phone, the remote party always hears an echo 
on it's side. We do not hear an echo. Doesn't matter who is the calling 

But if we use a SIP extension, no echo.

I've built /lib/modules/4.3.3-303.fc23.x86_64/dahdi/dahdi_echocan_oslec.ko

And requested oslec echo cancel:

grep oslec /etc/dahdi/system.conf

grep echo /etc/asterisk/chan_dahdi.conf

but it's never loaded:

# lsmod | grep echo
[root at asterisk ~]#

dahdi_cfg -vvv
DAHDI Tools Version - 2.10.0

DAHDI Version: 2.11.0
Echo Canceller(s):

Channel map:

0 channels to configure.

I can manually insert the oslec module using modprobe.

Thats seems to work.

CLI> dahdi show version
DAHDI Version: 2.11.0 Echo Canceller: OSLEC

But it's not persistent across reboots.


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