Deploying Enterprise Voice with Skype for Business 2015 — Question 3

Your company purchases a subscription to Microsoft Office 365.
The company has a strict firewall and an Internet usage policy. Only required ports are open between the internal network and the Internet.
Users report that they can use the following Office 365 features:
✑ Access email by using Outlook Web App.
✑ Establish chat sessions by using instant messaging (IM).
The users also report that they fail to join online audio conferences and online video conferences.
You need to open outbound ports on the firewall to ensure that the users can join online audio and video conferences.
Which two ports or port ranges should you open? Each correct answer presents part of the solution.

Answer options

• A. TCP 5223
• B. UDP 5223
• C. TCP 50,000 to 59,999
• D. UDP 50,000 to 59,999
• E. UDP 3478
• F. TCP 3478

Correct answer: C, E

Explanation

The correct answer is C and E because UDP 3478 is used for media connectivity in audio and video calls, and the TCP port range 50,000 to 59,999 is used for media streaming in Skype for Business. The other options do not pertain to the required connections for audio and video conferencing features.