MS-700 Monitor, Report on, and Troubleshoot Teams Practice Question
You are a Teams administrator. A user reports that they cannot make outbound calls to external phone numbers using Teams. You have configured Direct Routing with an SBC. You need to troubleshoot the issue. You run the Microsoft Teams admin center's call analytics and see that the call failed with the response code '480 Temporarily Unavailable'. What is the most likely cause?
⚠ Common exam trap
The trap here is assuming that any call failure is due to user configuration or dial plan, when the SIP response code specifically indicates a temporary server-side issue.
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 SBC is experiencing a temporary outage or is overloaded, causing it to reject the call.
The '480 Temporarily Unavailable' SIP response code indicates that the SBC or the destination is temporarily unable to accept the call, often due to overload or a temporary outage. This is the most likely cause when the SBC is experiencing issues. Other options point to permanent errors that would produce different response codes.
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 user's dial plan is misconfigured, causing the call to be routed to an invalid number.
Why it's wrong here
A misconfigured dial plan would likely result in a '404 Not Found' or '484 Address Incomplete' error, not '480 Temporarily Unavailable'. The 480 code specifically points to a temporary condition, not a permanent routing error like a dial plan issue.
- ✗
The user's account is not enabled for Enterprise Voice.
Why it's wrong here
If the user were not enabled for Enterprise Voice, the call would not be attempted, and the error would likely be a different code or a provisioning error. A '480 Temporarily Unavailable' indicates the call reached the SBC but the destination was unavailable, not a user configuration issue.
- ✓
The SBC is experiencing a temporary outage or is overloaded, causing it to reject the call.
Why this is correct
A '480 Temporarily Unavailable' response indicates that the SBC or the next hop is temporarily unable to handle the call, often due to overload, maintenance, or network issues. This matches the scenario where the SBC is not able to route the call at that moment. It is the most likely cause among the options.
- ✗
The SBC is unable to route the call to the PSTN because the destination number is incorrect.
Why it's wrong here
An incorrect destination number would typically result in a '404 Not Found' or similar, not '480 Temporarily Unavailable'. The 480 code indicates the endpoint is temporarily unavailable, which could be due to network issues or the SBC being down, not a wrong number.
About these practice questions
This MS-700 question is part of Courseiva's 211-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.