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For automatic testing scenarios, it is very useful to be able to
artificially create line alarms.  This allows testing of the whole
stack through DAHDI itself, DAHDI-interfaces in applications and
actual applications.

It introduces a new DAHDI_SIMULATE_ALARM ioctl() whcih has to be
issued on /dev/dahdi/ctl and which can be used to set or remove
any simulated alarms on the given span.