DRAG DROP
You have a server that has Exchange Server 2013 installed.
You plan to configure Unified Messaging (UM) to connect to an IP-PBX.
A telecommunications administrator configures the following numbers on the IP-PBX:
First extension number: 12100
Last extension number: 12499
Help extension number: 12500
Incoming pilot number: 12000
You need to configure UM to support the following requirements:
Users must be able to use Outlook Voice Access.
Users must be able to receive voice mail when callers connect to the users’ extension.
Callers must be able to dial into an automated help system hosted by your company, which uses
standard menus and speech-enabled menus.
Which numbers should you use for the UM configurations?
To answer, drag the appropriate number to the correct UM object in the answer area. Each number
may be used once, more than once, or not at all. Additionally, you may need to drag the split bar
between panes or scroll to view content.
Answer: 
Explanation:
Presumably here, we can ignore 12100 to 12499 as these are user extension numbers.
The help number will be 12500, so this is an auto attendant in other words.
The other 2 are the only option left (12000)