Microsoft MS-721: Collaboration Communications Systems Engineer

Last checked October 22, 2026 against the official Microsoft exam page.

1. Question 1Configure and manage phone numbers and calling

   An administrator must assign a phone number to a user so that the user can make and receive calls. Which two items are required besides the number?

   1. AA channel in the team and a display name for the group owner
   2. BA Teams Phone license and a calling policy assigned to the user
   3. CA meeting policy and a theme color for the Teams client app
   4. DA shared mailbox and a playlist for the music library
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   Correct answer: B

   A Teams Phone licence and a calling policy enable calling for the user. Meeting policies, channels and mailboxes do not enable calling.

2. Question 2Troubleshoot and monitor voice

   Users on one VPN report poor audio on calls, while users on the office network do not. Which tool identifies per-call network metrics for the affected calls?

   1. AThe Teams organization chart and roster
   2. BA wallpaper preview gallery in the client
   3. CThe printer status page on the network
   4. DCall Analytics and the Call Quality Dashboard
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   Correct answer: D

   Call Analytics and the Call Quality Dashboard show per-call network metrics such as jitter and packet loss. Wallpapers, printer pages and org charts do not measure call quality.

3. Question 3Plan and deploy calling

   An organization wants to move from an on-premises PBX to Teams Phone and keep its existing phone numbers. Which process should be used?

   1. AForward every incoming call to a personal mobile phone using call forwarding, and keep the old PBX running
   2. BPort the existing numbers to Microsoft, using a porting order with the current carrier
   3. CBuy new numbers for every user from a new carrier and ignore the old ones, which can be deleted
   4. DKeep the on-premises PBX indefinitely for calling and add Teams for chat, with numbers kept
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   Correct answer: B

   Number porting moves existing numbers to Teams calling with a porting order. Buying new numbers, keeping the PBX indefinitely and call forwarding do not complete the migration correctly.

4. Question 4Configure call queues and auto attendants

   A company wants callers to hear a menu that routes them to sales or support based on their key presses. Which Teams feature provides this?

   1. AAn auto attendant with menu options that route to call queues or users
   2. BA shared mailbox with a forwarding rule for inbound messages
   3. CA call queue with no menu and a single agent group for calls
   4. DA meeting invitation sent to the callers with a dial-in number
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   Correct answer: A

   An auto attendant presents a menu and routes callers by key presses to queues or users. A call queue without menu, shared mailboxes and invitations do not provide menu routing.

5. Question 5Configure and manage phone numbers and calling

   A business wants to allow an executive's assistant to answer calls on behalf of the executive. Which feature supports this?

   1. ATurning off calls for the executive account and redirecting them to voicemail permanently
   2. BForwarding calls to a public voicemail greeting shared with external callers and vendors
   3. CSharing the executive's password with the assistant so they can sign in remotely
   4. DDelegation of calls with call delegation settings in the calling policy
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   Correct answer: D

   Call delegation settings allow assistants to manage calls for a manager. Sharing passwords is unsafe, public voicemail is inappropriate, and turning off calls is not delegation.