*Update*

Faulty hardware has been replaced and all telephones are working.
A few phones were affected in other buildings including Beamish-Munroe, Goodwin, Queen's Centre, Kinesiology and Walter Light.
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Previous Description (2013-07-21 11:30:47):

Routine diagnostics in the campus telephone system is indicating a fault affecting MacArthur Hall in particular but some other locations as well. There may be temporary telephone service outage for several minutes while hardware is replaced.