I understand that Webex Calling PSTN and the Webex Contact Center PSTN are different. But there must be a way to integrate these 2 from within Control Hub. 

I have 2 Cisco 8811 phones that have been migrated to Webex Calling from CUCM. They have been active and working with Webex Calling for several months. No changes have been made in Control Hub and users have been working normally. Now all of a sudden...