I zapata.conf Row 1 Col 1 11:48 Ctrl-K H for help [trunkgroups] [channels] language=en context=default switchtype=national ;signalling=fxo_ls rxwink=300 ; Atlas seems to use long (250ms) winks usecallerid=yes hidecallerid=no callwaiting=no usecallingpres=yes callwaitingcallerid=yes threewaycalling=yes transfer=yes canpark=yes cancallforward=yes callreturn=yes echocancel=yes echocancelwhenbridged=no echotraining=no relaxdtmf=yes rxgain=0.0 txgain=0.0 callgroup=1 pickupgroup=1 immediate=no busydetect=yes busycount=5 ;; Andrei: was=4 answeronpolarityswitch=yes hanguponpolarityswitch=yes musiconhold=default ;signalling=fxo_ks ; FXS for ringing phones echocancel=yes ; You can set this to 32, 64, or 128, tweak to your needs. echocancelwhenbridged=yes callerid=asreceived group=3 context=from-internal signalling = fxo_ls channel=>1-24 group=0 context=from-zaptel signalling = fxs_ks channel=>25-28 group=1 context=from-zaptel signaling = fxs_ks channel=>28