Echo problem, BUT only on inbound calls


#1

I’ve got AAH running with a TDM400P on normal British telecom phone lines. Whenever someone calls in the person picking up the phone has a very loud echo, which fades away for a while, then returns a few minutes later. Oddly though if you make an outbound call, no echo at all. I’ve experimented with FXOTune, and the TX/RX gains, echo cancellation etc. No joy.

Any thoughts?


#2

Can you post the relevant section of your zapata.conf?


#3

Hi stofell,

apologies for not replying sooner, I was despatched to the wilds of Aberdeen!

The zapata.conf is below, I did try various combinations of echocancel, and echotraining, also from voip-wiki and by using the gain meter I tried some rxgain, txgain values.

As an aside I don’t think faxdetect=no, has any effect!

Cheers
Gordon

[channels]

language=en
context=from-pstn
signalling=fxs_ks
rxwink=300 ; Atlas seems to use long (250ms) winks
;
; Whether or not to do distinctive ring detection on FXO lines
;
;usedistinctiveringdetection=yes

usecallerid=no
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
rxgain=0
txgain=0
group=0
callgroup=1
pickupgroup=1
immediate=no

;faxdetect=both
;faxdetect=incoming
;faxdetect=outgoing
faxdetect=no

;Include AMP configs
#include zapata_additional.conf

;Include genzaptelconf configs
#include zapata-auto.conf