[channels]
context=zaptel-incoming
switchtype=national
pridialplan=unknown
prilocaldialplan=unknown
signalling=fxo_ls
;signalling=pri_cpe ; pri_cpe = PRI slave ; pri_net = PRI master
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
echotraining=300
rxgain=0.0
txgain=0.0
group=1
callgroup=1
pickupgroup=1
immediate=no
callerid=asreceived
musiconhold=default

switchtype=national
dialplan=unknown
prilocaldialplan=unknown

echocancel=yes ; You can set this to 32, 64, or 128, tweak to your needs.
;echocancel=64 ; You can set this to 32, 64, or 128, tweak to your needs.
echocancelwhenbridged=yes
echotraining=400 ; Asterisk trains to the beginning of the call, number is in milliseconds
callerid=asreceived

group=1
context=zaptel-incoming ; Points to the default context of your extensions.conf
;channel => 1-23 ; Set this to 1-15,17-31 for E1