HOTSPOT
You have an Exchange Server organization that contains four servers. The servers are configured as
shown in the following table.
SiteA contains an IP gateway that uses a dial plan named Dialplan1. SiteB contains a Lync Server
2013 server that uses a dial plan named Dialplan2.
You plan to migrate all Unified Messaging (UM) functionalities to Exchange Server 2013.
You need to identify which tasks must be performed to complete the migration.
Which tasks should you identify? (To answer, select the tasks that are required and not required in
the answer area.)
Answer: 
Exchange servers can be added to SIP URI (Lync) dial plans and can’t be added to Telephone extension and E.164 dial plans.
Dial Plan 1 – IP Gateway
Dial Plan 2 – SIP URI
Exchange 2010 only UM role contains UM specific components
Exchange 2013, both CAS and Mailbox roles contains UM specific components.
So, for me the answer looks like-
Ex3 to Dial plan 1 – Not Required – Number plan, CAS and MBX Automatically answers
Ex4 to Dial plan 1 – Not Required – Number plan, CAS and MBX Automatically answers
EX1 to Dial PLan 2 – Not Required – No UM role
Ex2 to dial plan 2 – Required – SIP URI and 2010 UM role
Ex3 to dial plan 2 – Required – SIP URL requires adding both CAS/MBX to dial plan.