MS-700 Manage Meetings and Calling Practice Question
You manage a Teams Phone deployment with Direct Routing. Your organization has a policy that all outbound calls to international destinations must be routed through a specific Session Border Controller (SBC) named SBC-Intl, while domestic calls use SBC-Dom. You create a voice route for international calls with a PSTN usage and assign it to a voice policy. A user reports that international calls fail with a 'Call not allowed' message, but domestic calls work. You verify the user has the correct voice policy. What is the most likely cause?
⚠ Common exam trap
The trap here is focusing on SBC configuration or dial plans when the error message 'Call not allowed' specifically points to a policy restriction, such as a missing PSTN usage in the user's voice policy.
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
✓
The voice route for international calls is not associated with the correct PSTN usage, or the PSTN usage is not added to the user's voice policy.
The 'Call not allowed' error for international calls while domestic calls succeed indicates that the user's voice policy lacks the PSTN usage associated with the international voice route. In Direct Routing, voice routes are linked to PSTN usages, and those usages must be included in the voice policy assigned to the user. Without the correct PSTN usage, Teams blocks the call before it reaches the SBC. Verifying the voice policy's PSTN usages and the voice route's associated usages resolves the issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The voice route for international calls is not associated with the correct PSTN usage, or the PSTN usage is not added to the user's voice policy.
Why this is correct
In Direct Routing, a voice route must be linked to a PSTN usage, and that PSTN usage must be included in the voice policy assigned to the user. If the international PSTN usage is missing from the user's voice policy, the call is blocked with 'Call not allowed'. Domestic calls work because their PSTN usage is correctly assigned. This is the most common cause of selective call failures.
- ✗
The user's dial plan does not normalize the international number to E.164 format.
Why it's wrong here
While dial plan normalization is important, the error 'Call not allowed' typically indicates a policy or routing restriction, not a normalization failure. If normalization were the issue, the call would likely fail with a different error or not route at all. The user can make domestic calls, so normalization for domestic numbers is working; international normalization might be missing, but the specific error points to policy enforcement.
- ✗
The SBC-Intl is not configured to allow international calls in its trunk configuration.
Why it's wrong here
While SBC configuration can affect call completion, a 'Call not allowed' error is generated by Teams policy enforcement before the call reaches the SBC. If the SBC were the issue, the error would likely be different, such as a SIP 403 or timeout. The fact that domestic calls work through SBC-Dom suggests the SBCs are reachable, and the policy is the gatekeeper for international dialing.
- ✗
The user's account is not enabled for Enterprise Voice.
Why it's wrong here
If the user were not enabled for Enterprise Voice, they would not be able to make any PSTN calls, including domestic calls. Since domestic calls succeed, Enterprise Voice is enabled. The selective failure for international calls points to a policy or routing configuration specific to international destinations, not the overall voice enablement.
Visual reference
About these practice questions
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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
This MS-700 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-700 exam.