Someone

[channels]
; general settings
usecallerid=yes
callerid=asreceived
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
immediate=no
callprogress=no

; to enable/disable music onhold
musiconhold=default

; This tells asterisk to try and kill line
; echo using software detection.
echotraining=yes
echocancel=yes
echocancelwhenbridged=yes

signalling=fxs_ks
context=mainmenu
channel=>1 -4