*Update*

The upgrade was completed this morning. Contact Center services were affected only for about 30 minutes between 7:00am and 7:30am.
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Previous Description (2015-12-18 10:40:30):

Telephone Call Center services will be upgraded on Sunday, December 20th between 6:00am and noon.

- This work will only affect incoming call center applications. Callers to contact center applications will hear ring-no-answer during the upgrade.
- Regular telephone service and voice mail will NOT be affected.

This is the second voice system upgrade intended to extend support with the system vendor.