*Update*
The tie lines to KGH are now operational.
Failure was due to a planned power outage at a KGH building on Barrie Street.
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Previous Description (2016-07-06 09:36:47):

IT Services is investigating a telephone problem dialing 81 for a direct connection to KGH.
Callers were experiencing "dead air" after dialing 81 and will now hear a fast busy tone until the problem is resolved.
In the meantime, to reach KGH extensions, please call their auto-attendant at 613-549-6666.