[channels] ;omit this line if you are including these lines in zapata_additional.conf context = default switchtype = Euroisdn usecallerid = yes callerid=asreceived echocancel = yes pridialplan = local echocancelwhenbridged = yes ;add the is option if you are problems with DTMF detection relaxdtmf = yes rxgain = 0.0 txgain = 0.0 signalling = pri_cpe group =1 channel => 1-10