Recently I bought 4 HPEC channels.
I implemented them with very disappointing results.
Asterisk 1.2.15 / Zaptel 22.214.171.124
Using 3 x x-lite and 1 x Aastra 9133i
Pentium 4 3.0Ghz / 1Gb Memory.
The HPEC install was successful. The echo was COMPLETELY ELIMINATED in the beginning I was amazed with the effectiveness of the HPEC.
The problem was, the audio was almost completely one way - unless the remote caller / called party shouted. All normal/low volume audio was clipped. The only sound that could be heard from the remote caller / called party was if they shouted - and then it would just be the peak of the sound. Audio from the Asterisk end out to the remote party was working as normal.
I tried many different settings including various levels of RX/TX gain. I variations of settings of echocancel=, echotraining= and echocancelwhenbridged= in zapata.conf. I found HPEC worked when all of the above where commented out.
I was on site from 09.00 until 15.00 and in the end, I had to revert to running WITHOUT hpec, and promise the customer I will come back with a definitive solution on Monday. I have reseigned myself to footing the bill for an Analogue card with hardware echo cancellation. (Sangoma A200E) - It was either that or remove the Asterisk installation completely.
I am disappointed with HPEC, and at spending $40.00, and also that I have to spend Â£270.00 for a new card / modules.
Does anyone have any idea how I can stop HPEC clipping the audio? I tried Digium support by email but have not had a reply yet (approx 30hrs).
I would try Octastic Echo Cancellation software, but the client is getting a bit fed up of the sight of me. I need to get this sorted and the only possibility I can think of is the A200E.
Any assistance greatfully received.