[channels]
  language=es
  usecallerid=yes
  callwaiting=yes
  threewaycalling=yes
  transfer=yes
  echocancel=yes
  echocancelwhenbridged=no
  echotraining=800

  cancallforward=yes
  callreturn=yes
  relaxdtmf=yes
  immediate=no
  busydetect=yes
  busycount=10
  musiconhold=default

  signalling=fxs_ks
  callerid=asreceived
  context=from-zaptel
  channel => 1,4