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Hi All,

We have working MRA setup. Jabber over MRA works fine.

We want to register Cisco 8845 IP phone over the Internet using this MRA setup.

Can someone please help to understand additional setup required for same.

Have followed this document : https://ciscocollab.wordpress.com/2015/05/26/collab-edge-mra-for-78008800dx-series-endpoints/ 

But getting error message "Server Certificate Validation Failed. Contact your administrator"

I have used attached Public Root Certificate on my VCS-E.