MS-700 Manage Meetings and Calling Practice Question
Your organization uses Microsoft Teams Phone with Direct Routing. A department must be able to make outbound calls only to numbers in the United Kingdom, and all other outbound destinations must be blocked. You have created a voice route containing only the UK PSTN gateway and a PSTN usage named 'UK-Only'. What should you do next to enforce this restriction for the department's users?
⚠ Common exam trap
The trap here is believing that building a UK-only route or dial plan is enough, when the restriction only takes effect once a voice routing policy containing that usage is assigned to the users.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a voice routing policy that contains the 'UK-Only' PSTN usage and assign it to the department's users.
Voice routing policies are the user-facing authorization layer: they contain the PSTN usages that determine which routes a user may use. Restricting the department to a policy holding only the UK usage ensures only the UK route can be selected, so all other destinations fail to find an authorized route and are blocked. The route and usage must already exist and be referenced by that policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a voice routing policy that contains the 'UK-Only' PSTN usage and assign it to the department's users.
Why this is correct
A voice routing policy is the object that ties a user to a set of PSTN usages, and therefore to the routes those usages reference. Assigning a policy containing only the UK usage means the user's outbound calls can match only the UK route; any other destination finds no authorized route and is blocked. The route and usage alone do not restrict a user until a policy references them.
- ✗
Add the 'UK-Only' PSTN usage to the global voice routing policy and remove all other usages from it.
Why it's wrong here
Editing the global voice routing policy would change outbound calling for every user in the tenant who inherits it, not just the department. That could block legitimate international calling for the rest of the organization. The requirement is scoped to one department, so a dedicated policy assigned only to those users is the correct approach rather than altering the tenant-wide default.
- ✗
Configure a tenant dial plan with an international call prefix of 0 and assign it to the department's users.
Why it's wrong here
An international call prefix controls the digits a user must dial before an international number; it is a dialing convenience, not an authorization boundary. Users could still dial a full E.164 number directly and have it routed if their policy permitted it. This setting does not remove other PSTN usages from a user's effective routing, so it cannot enforce a UK-only restriction.
- ✗
Create a dial plan that includes only the United Kingdom country code and assign it to the department's users.
Why it's wrong here
Dial plans normalize the digits a user dials into E.164; they do not authorize or block destinations. A dial plan limited to a country code would still allow a properly normalized number for any country to be routed if a matching route and usage exist. Destination restriction is enforced by which routes a user's voice routing policy authorizes, not by normalization.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
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