*Update*

This work has been completed. The voice messaging and contact centre services were back in operation at 8:00am.
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Previous Description (2015-12-01 13:28:30):

Modifications to the University voice messaging system will take place (again) on Sunday, December 6th between 6:00am and 9:00am.
- Telephone service will NOT be affected.
- Voice mail will be intermittently unavailable during that time.
- Telephone Contact Centre applications will be unavailable for up to 3 hours.
Callers to these applications may hear different call treatments depending on the status of the work. Treatments may be ring-no-answer, busy signal or the recording "The voice messaging system is temporarily unavailable".

These changes are required to maintain our current level of support from the system vendor.