[Asterisk-Users] Echo cancellation, when software doesn't cut it. Whats next?

[Rich Adamson]

> Over the last couple weeks I've tried everything I could get my hands on
> in an attempt to get rid of my echo problems. Using a CVS checkout of
> just yesterday, I've tried every echo cancellation routine in zconfig.h
> (including Mark2 w/Aggressive) , as well as the echotraining=800
> mentioned on this list just last week. 
> 
> While some things worked better then others, I would consider none
> acceptable solutions in my situation. Playing with rx/tx gain values
> just seemed to quiet the voice down and along with that the echo
> happened to be less noticeable. I could almost get the echo to disappear
> with a low enough rx/tx gain, but then the voice could barely be heard,
> or DTMF tones stopped working.
> 
> So whats the next step? 
> 
> I only get echo when dialing over the PSTN. Using Nufone to dial a PSTN
> number results in absolutely zero echo. Do I put in a request for a
> Telco technician to come out and take a look at the lines? 
> 
> One page on the Wiki says:
> 
> "Most of the telco's have technicians with the equipment necessary to
> help find the problem if the problem really is their outside plant.
> However, getting to that person can be a real challenge."
> 
> Any suggestions on ways to overcome the challenge of getting the right
> technician on the phone? 

Mike,

Contact me off list and let's see if we can isolate the issue. Can't
tell from the words you've used what steps you've gone through to date.

Rich