We are having echo problems with 1 in 6 calls on our Asterisk system. It's
a one
sided echo, users hear their own voice delayed about half a second and slightly
attuneated. Without the echo canceller in Asterisk enabled echo problems occur
on 1 in 3 calls and is much worse. We have a trouble ticket open with SBC and
have thus far failed to find a cause (they do not believe that it is being
caused by
hybrid imbalances however). I would like to know any advice you would have
that does not require Asterisk or Zaptel to be recompiled. Our details are as
follows:
-T1 using E&M wink
-Polycom 300's and 500's (SIP phones with g.711)
-Digium TE110p (has it's own interrupt)
-echocancel = yes (have also tried 32, 64, 128, 256; 128 works best so far)
-echotraining = 400 (have also tried 200, 400, 800; seems to have no effect,
the wiki says the max is higher but asterisk does not like anything higher than
999ms)
-Asterisk Ver. 1.0.7 running on P4 3.0Ghz with 2Gb ram and Asus p4p800 mb
E&M takes some time for call setup, is Asterisk's echo canceller
training during
this time? If so would switching to PRI alleviate the problem?
Thanks for any help you can offer,
-Bill Lattner
