[Asterisk-Users] echo problem + choppy sound

[sdgesa gaeharth]

I still hear a slight echo of my voice when I talk with somone out the PSTN.  The voice on the other end sounds very choppy and a little distorted. When I talk to other people within our office, the sound is perfect.Can some help?

We are all using:

Polycom 501 <--> asterisk <--> PSTN

zapata.conf:
[channels]
group = 1
language=en
context=incoming
signalling=fxs_ks
switchtype=national
usecallerid=yes
hidecallerid=no
callwaiting=yes
musiconhold=default
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echotraining=yes
echocancelwhenbridged=yes
rxgain=10.0
txgain=10.0
channel => 1-4

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