Mine

; Basic ISDN Card TE mode config
resetinterval=never
immediate=no
switchtype=euroisdn
signalling=bri_cpe_ptmp
pridialplan=dynamic
prilocaldialplan=local
nationalprefix=0
internationalprefix=00
usecallingpres=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=100
context=from-zaptel


group=0,1
channel => 1-2
group=0,2
channel => 4-5