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RINGING.NLM is a NLM module which does nothing but rings as a phone on the server. This is kind of funny stuff but can also be used in batch/script files to inform administrator with noisy acoustic signal that something unusual has happened on the server.
RINGING.NLM has one or two optional parameters - first parameter sets number of ringing repeats (default=3), and second parameters sets approximate length of tones in ms (default=80).
Usage: LOAD RINGING [nr_of_repeats [delay]]