Mine

zapata.conf

[channels]
echotraining=yes
language=en
context=default
usecallerid=yes
hidecallerid=no
immediate=no
musiconhold=default

signalling=fxs_ks
echocancel=yes
group=1
channel=3
callerid=Line 1
rxgain=0
txgain=0

signalling=fxs_ks
echocancel=yes
group=1
channel=4
callerid=Line 2
rxgain=0
txgain=0