DAHDI_ATTACH_ECHOCAN failed on channel 1: Invalid argument (22)
Currently, on a new install of the latest FreePBX, the DAHDI module has some problems with echo cancellation on FXO/FXS cards. This will cause the module to not load correctly. This may be fixed in the future.
First and foremost, reboot. I’ve had it to where I run dahdi_cfg and it produce this error when setting hwec as the canceler. A reboot fixes it.
DAHDi seems to want to use oslec echo canceler by default, however it’s not a module that’s normally loaded. There are 2 solutions to this issue. First is to use the MG2 echo canceler. This is the easiest, however, the oslec echo canceler is actually better. I will go through both:
Change to MG2 Echo Canceler:
sudo vi /etc/dahdi/system.conf
Change the line:
You’re line may vary based on how many channels you have.
Run the config again with some output, it should work now:
sudo dahdi_cfg -vvvvv
Fix OSLEC Echo Canceler:
I haven’t been able to get it work yet… stay tuned.