+# Tones/announcements are streamed from user space. It is possible to use
+# the module "mISDN_dsp.o" instead. It provides simple tones with much less cpu
+# usage. If supported by special hardware, tones are loops that require no
+# bus/cpu load at all, except when the tone changes.
+# Use parameter "american", "german", or "oldgerman". "oldgerman" sounds like
+# the old german telephone system used until end of year 1998.
+# This can be overridden by the the tones_dir in the interface.conf.
+# Both options.conf and interface.conf can be overridden by extension setting.