11.21.0 : Echo Woes : Can’t Install Canceller

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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 party.

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 echocanceller=oslec,1,2,4

grep echo /etc/asterisk/chan_dahdi.conf echocancel=yes echocancelwhenbridged=no echotraining=yes

but it’s never loaded:

# lsmod | grep echo
[root@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.


One thought on - 11.21.0 : Echo Woes : Can’t Install Canceller

  • And even if I do manually load the oslec kernel module, I don’t think it’s actually being used

    cat /proc/dahdi/1
    Span 1: WCTDM/4 “Wildcard TDM400P REV I Board 5” (MASTER)

    1 WCTDM/4/0 FXOKS (In use)
    2 WCTDM/4/1 FXOKS (In use)
    3 WCTDM/4/2 Reserved
    4 WCTDM/4/3 FXSKS (In use) RED

    AFAIK, the echo canceller should show up here.