HOTSPOT
You have an Exchange Server 2013 organization.All users are enabled for Unified Messaging (UM) and access their voice mail by using Microsoft Lync
2010.
Callers report that when they press a key to dial an external telephone number, they hear a message
indicating that the intended destination cannot be reached.
You need to ensure that the callers can reach the external number successfully.
What should you modify?
To answer, select the appropriate object in the answer area.
Answer: 
Explanation:
Note:
After you create a Unified Messaging (UM) dial plan, you can view and configure a variety of
settings. For example, you can configure the level of Voice over IP (VoIP) security, the audio codec,
and dialing restrictions. The settings that you configure on the UM dial plan affect all users who are
linked with the dial plan through a UM mailbox policy.