[Asterisk-Users] Some echo?

[Robbie Hughes]

I have a 12 channel PRI with SNOM 190's and asterisk CVS from January.
Most calls are fine, all incoming calls are fine, but I am getting  
echo on a significant number of outgoing calls.
The person on the other side hears a perfect call, but the SIPphone  
side gets to hear themselves.

It happens 100% of the time to some numbers (outgoing only), and only  
sporadically to others.

Has anyone ever experienced this?
the RTT to the phones from the server is less than 10ms and it is a  
100mbit network with no traffic and cisco switches.

zapata.conf attached below:
Note: The commented out gain of +2 on outgoing seems to make no  
difference to the effect.


Has anyone got any ideas?

;
; Zapata telephony interface
;
; Configuration file

[trunkgroups]
group => 1,16
[channels]
spanmap => 1,1,1
language=en
context=from-pstn
rxwink=300              ; Atlas seems to use long (250ms) winks

usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=800
;txgain=2.0
txgain=0.0
rxgain=0.0

group=1
callgroup=1
pickupgroup=1
immediate=no
pridialplan=unknown
overlapdial=yes
signalling=pri_cpe
switchtype=euroisdn
channel=> 1-12
faxdetect=both