[Asterisk-Users] Newbie - Echo on Incoming calls

[Rich Adamson]

> I have a setup of Asterisk with TDM13B card (1FXS,3FXO ports) and
> acouple of Cisco 7960 IP phones on SIP. So far i have managed to get the
> internal SIP calls going through without a hitch and can get to call
> through to the analog lines (SIP --> ANALOG) without any echos. However
> whenever we receive an incoming call via the analog lines (ANALOG -->
> SIP), there is an echo for about 15-30 seconds and it fades off
> thereafter
> 
> Initially i had an echo on both calling and receiving until i enabled
> the echotraining=yes option and that seemed to have cleared the outgoing
> calls. 
> 
> 
> I cant seem to establish where the problem is. Please see my zapata.conf
> file below.
> 
> PS: I have tried various values i.e FXS_KS and FXS_LS, also the tx and
> rx values as well but none seem to be working.

Try echotraining=800 and see what happens. Don't forget to stop/start
asterisk; reload won't cut it.