I’m having some echo problems that I’d like to get rid of. So far the staff is being patient with me but I don’t expect that to last forever.
I have a TDM2400P with the hardware echo cancellation card. The connections to the CO lines are 4 foot runs from the 66 block into the 24 port patch panel sold by digium.
I have individualy set the tx/rx gain on each channel to balance them out and run fxotune, but I’m still getting some really obnoxious echo on random lines. The echo is usually most prevalent at the start of a call but can start in the middle of a conversation and typically lasts about 15 seconds but has been reported to last for several minutes on a couple of occasions.
After a reboot of the box I typically login, stop Asterisk, and then run fxotune -s and then restart Asterisk.
I have the following at the top of the [channels] section of chan_dahdi.conf:
My questions are:
Should I include the ‘echocancel’ directives on each channel?
Are there any other directives I can/should include?
How do I automate the fxotune -s command to run if the box has to be rebooted? (CentOS 5.2)
Any nuggets of wisdom would be appreciated.