Microsoft MS-721 Practice Exams
Last updated on Oct 24,2026- Exam Code: MS-721
- Exam Name: Collaboration Communications Systems Engineer
- Certification Provider: Microsoft
- Latest update: Oct 24,2026
Your company has a Microsoft Teams Phone deployment that uses Direct Routing and a single carrier.
You deploy a new Session Border Controller (SBC) that shows as healthy in the Microsoft Teams admin center.
You place a test call over the new SBC, and the call succeeds.
When you attempt to transfer the call, the transfer fails. A portion of the SIP ladder is shown in the exhibit. (Click the Exhibit tab.)

What is a possible cause of the issue?
- A . The SSL certificate of the SBC is incorrect.
- B . The Refer on the SBC is misconfigured.
- C . notify is enabled in the SIP options of the SBC.
- D . The carrier rejects the format of the forwarded FROM number.
Your company uses Microsoft Skype for Business Server 2015 and Enterprise Voice as the PSTN solution.
You plan to migrate all users to Microsoft Teams Calling Plans.
You will decommission Skype for Business Server after the migration is complete.
You need to ensure that all the users retain their current phone number once the migration is complete. The solution must minimize the downtime of PSTN features for each user.
What should you do first?
- A . From the Microsoft 365 admin center, purchase Communications Credits for all the users.
- B . Schedule a port order for the phone numbers of all the users.
- C . From the Microsoft Teams admin center, order phone numbers for all the users.
- D . Migrate all the users to Teams.
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
Your company uses Microsoft Teams Calling Plans.
The company acquires a small development team. Currently, users on the team have their own direct inward dial (DID) numbers that have PSTN capabilities.
You migrate the users to Teams.
You need to ensure that the users have phone numbers.
Solution: From the Microsoft Teams admin center, you place a new order for service numbers.
Does this meet the goal?
- A . Yes
- B . No
HOTSPOT
You are evaluating Microsoft Teams meeting features for a user named User1.
User1 is a member of the groups shown in the following table.

You export the following meeting policy for User1.

You have group policy assignments for the meeting policies as shown in the following table.

For each of the following statements, select Yes if the statement is true. Otherwise, select No. NOTE: Each correct selection is worth one point.

Your company has an office in Adelaide.
The company has a Microsoft Teams Phone deployment.
You acquire a new service number that has the local Adelaide area code.
You need to update the default conferencing toll number for only the users in the Adelaide office.
Which two actions should you perform? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.
- A . Configure a customization policy.
- B . Assign the policy to the Adelaide office users.
- C . Assign the number to a resource account.
- D . Configure an audio conferencing policy.
- E . Modify the Assigned phone number setting for each Adelaide office user.
- F . Modify the global (Org-wide default} audio conferencing policy.
You have a Teams Phone deployment.
When you review the Server – Client summary reports in Teams, you discover that Wired inside data is unavailable as shown in the following exhibit.

You need to review the monthly and daily trends in the reports.
What should you do?
- A . From the Microsoft Teams admin center, upload reporting labels.
- B . From the Microsoft Teams admin center, configure the network topology.
- C . From the Microsoft Call Quality Dashboard, upload the Endpoint data file.
- D . From the Microsoft Call Quality Dashboard, upload the Building data file.
HOTSPOT
Your company has a Teams Phone deployment.
The network team at the company completes a local internet breakout for Teams traffic.
To validate the configuration, you review the Call Debug log shown in the following exhibit.

Use the drop down menus to select the answer choice that completes each statement based on the information presented in the graphic. NOTE: Each correct selection is worth one point.

DRAG DROP
You need to provision a Microsoft Teams-certified common area phone device at a field site. The solution must ensure that a standard user can complete the physical handset tasks without sharing credentials.
Which four actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.

You have a Microsoft I earns deployment and an existing telephony solution that provides PSTN capability to on premises third-party PBX systems in two separate locations.
You need to implement a redundant PSTN solution for Microsoft Teams Phone. The solution must use the existing telephony earner services. The solution must ensure that outbound calls can be made if a component fails.
Which three components should you implement? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point
- A . highly available Session Border Controllers (SBCs)
- B . calling policies
- C . PSTN usages
- D . voice routing policies
- E . tenant dial plans

