MS-700 Manage Meetings and Calling Practice Question
You are a Teams administrator for a company that uses Direct Routing. A user reports that when they dial a 10-digit phone number from the Teams client, the call fails immediately with 'Call failed'. You verify that the user has a valid Phone System license and an assigned phone number. You need to ensure that calls to external PSTN numbers are routed correctly. What should you configure?
⚠ Common exam trap
The trap here is assuming that a Phone System license alone enables outbound PSTN calling, when a voice routing policy is also required to normalize and route the dialed number.
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 and assign it to the user.
For Direct Routing, outbound PSTN calls require a voice routing policy that contains normalization rules and PSTN usage records linked to a voice route. Without this policy assigned, Teams cannot translate the dialed number or determine which SBC to send the call to, resulting in immediate failure. The other options do not provide the necessary routing logic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a calling policy with 'Allow calling' enabled.
Why it's wrong here
A calling policy controls features like call forwarding and simultaneous ring, but it does not define number normalization or PSTN routing. Even if calling is allowed, the lack of a voice routing policy means the dialed digits are not translated or matched to a route. Thus, the call would still fail because no path to the PSTN exists.
- ✗
Assign an audio conferencing license to the user.
Why it's wrong here
Audio conferencing licenses provide dial-in conferencing capabilities, not PSTN calling for individual users. They do not supply the dial plan, voice routing policy, or PSTN usage needed for Direct Routing outbound calls. The user already has a Phone System license, so adding audio conferencing would not resolve the immediate call failure.
- ✗
Add the user to a call queue.
Why it's wrong here
Call queues are used for automatic call distribution to agents, not for enabling outbound PSTN calling. Adding the user to a call queue would not provide the necessary dial plan or route for external calls. The user would still lack the routing configuration required to translate and route the dialed number to the SBC.
- ✓
Create a voice routing policy and assign it to the user.
Why this is correct
A voice routing policy (dial plan) defines normalization rules and PSTN usage records that map dialed numbers to the correct routes to the Session Border Controller (SBC). Without an assigned voice routing policy, Teams cannot determine how to route the call, causing immediate failure. Assigning the policy ensures the dialed number is normalized and matched to a PSTN usage, which is then associated with a route.
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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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