-#channel force,11,12,13,14,15,17,18,19,20,21,any
+#channel-in 1,2,3,4,5,6,7,8,9,10,22,23,24,25,26,27,28,29,30,31
+#channel-out force,11,12,13,14,15,17,18,19,20,21,any
+
+# Example of an ISDN interface that runs in NT-mode, but provides tones during
+# setup. Also we provide tones during setup also.
+# This is usefull to interconnect to another PBX.
+#[PBX]
+#port 5
+#earlyb yes
+#tones yes