Something

gw root # more /etc/asterisk/zapata.conf |grep -v ^\;|grep -v ^$|more
[trunkgroups]
[channels]
context=default
switchtype=national
signalling=fxo_ls
rxwink=300              ; Atlas seems to use long (250ms) winks
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
rxgain=0.0
txgain=0.0
group=1
callgroup=1
pickupgroup=1
immediate=no