Which of the following is a possible resolution?

The IP gateway is configured to connect to Exchange 2007 using an IP address.
When a user is migrated to Exchange 2013, the calls to UM never reach the UM call router service on an Exchange 2013 server. Firewall rules are correct.
Which of the following is a possible resolution?
A. Reconfigure the IP gateway to use the IP address of the Exchange 2013 server instead of the Exchange 2007 server.
B. Reconfigure the IP gateway so it can use DNS resolution.
C. Update the settings on the IP gateway to use the DNS name of the Exchange 2007 server.
D. Verify that the SSL certificates are correctly configured on the Exchange 2013 servers.

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