1/2 of the district phones cannot place an outbound call

Issue Resolved and full operations reinstated as of Friday, 10/26/18 at 5 pm.
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UPDATE: While our telephone company continues to troubleshoot the root cause of the issue and told us at 9:30 tonight that it might be another full business day before they can resolve matters properly, a contractor we engaged was able to reinstate outbound call service at ~5 pm this afternoon with an interim solution that permits the placement of outbound calls for all of our affected phones. 
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There is an issue with our telephone service that has left one of our two main communication channels not fully operational. As a result, while calls can be made TO all of our phones from those both inside and outside the district,  1/2 of our phones (numbers) cannot successfully place an outbound call. 

Our telephone company is aware of our outage and is working on service restoration -- we have no estimate yet as to when they will finish.