4 thoughts on - Oslec Echo Cancellation

• dahdi_echocan_oslec should be built by default. What you may miss is the
  ‘echo.ko’ (OSLEC) kernel module.

  Try:

  /sbin/modinfo echo

  Do you have it available?

  The https://notabug.org/tzafrir/dahdi-linux-extra repository is where I
  maintain a copy of DAHDI with OSLEC and from it I create the OSLEC patch for the DAHDI package in Debian.

• Ooopss.

  I did not make myself clear.

  All modules are in place and working – *if* I “modprobe” them manually.

  The problem is “service dahdi start” does not load echo+dahdi_echocan_oslec.

  I have a production system that does it. I just do not know how.

  After copying this system to another machine and upgrade it (apt-get dist-upgrade), echo+dahdi_echocan_oslec does not get inserted anymore and I am wondering why.

  I intend to upgrade the production system tomorrow night and this “bug” is haunting me.

  Regards

  Ethy

• The echo canceller modules get loaded automatically when needed: if you have the line ‘echocanceller=foo,12’ in /etc/dahdi/system.conf and run dahdi_cfg, dahdi_cfg will attempt to configure the echo canceller ‘foo’
  for channel 12. The DAHDI core (kernel code) will notice it has no such echo canceller and try to load a module caller ‘dahdi_echocan_foo’.

  So, what do you have in /etc/dahdi/system.conf ? What is the output of lsdahdi?

• I do have a bunch of lines like these:
  echocanceller=oslec,1-15,17-31
  echocanceller=oslec,32
  echocanceller=oslec,33

  May the problem be that in this copy we do not have the cards installed?

  Quit odd choice dahdi_cfg made if this is the case, since “service dahdi start” installed the drivers for these same inexistent cards!

  Nothing since the cards are installed inside the production system.

  Ethy