switchtype=national
 context=POTS-Incoming
 signalling=pri_cpe
 echocancel=yes
 callerid=asreceived
 group=1
 channel => 1-11

 signalling=fxo_ls
 context=faxhandler
 echocancel=no
 echocancelwhenbridged=no
 faxdetect=both
 channel => 25

 signalling=fxs_ks
 echocancel=yes
 usecallerid=no
 context=frontdoor
 channel => 50