On Wednesday 09 November 2005 01:31, John Lange wrote: > The one thing thats significant in the above pages is that latency can > be a significant factor and tuning Asterisk for more "taps" may help.
Unfortunately each 'tap' is 1/8ms in Asterisk. 128 taps is only good for about 16ms of echo tail. If your echo is longer than that, you won't be able to cover that kind of echo with the IAXy, whose rinky-dink processor is only good for very very VERY short echo tails (I'm not even sure it is close to the 128 taps that is "standard" with Asterisk itself). > Also, the echo may be worse with poor handsets so swapping them to see > if there is a difference may lead you down the right path. Absolutely. I usually try this trick to determine if it's acoustical or electrical echo that is causing issues. With a call in progress and echo being heard, unplug the actual handset from the rest of the telephone that is plugged in to the iaxy. Speak into the other phone. If the echo is still there, it's hybrid/electrical echo. If the echo is gone, it's acoustic echo and the sign of a shitty handset. Now to see if it's being mechanically coupled in the handset, plug the handset back in and cover up the mic and/or earpiece. If the echo goes away then the mechanical construction's sound (ha!), but the mic is overly sensitive, or your earpiece is awfully loud. -A.
