You have a Lync Server 2013 infrastructure. The infrastructure contains two sites. The sites are located in New York and Rome. Each site has Enterprise Voice deployed and contains separate dial plans and voice policies.
You plan to deploy dial-in conferencing to both sites.
In each site, you create a dedicated conferencing policy. You assign the conferencing policies to the respective users in each site.
You create a dial-in conferencing access number.
When you attempt to assign a region to the number, you discover that the regions are unavailable.
You need to ensure that you can add a region to the dial-in conferencing access number.
What should you modify?
A. The conferencing policies
B. The meeting configuration settings
C. The voice policies
D. The dial plans
