MS-721 · Question #128
MS-721 Question #128: Real Exam Question with Answer & Explanation
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Question
You have a Teams Phone deployment that uses Direct Routing on a single Session Border Controller (SBC). Users report that outbound PSTN calls are failing, but inbound PSTN calls are successful. When you review the SBC logs, you discover that Microsoft is responding to SIP option requests, but is NOT sending SIP option requests. What is the cause of the issue?
Options
- AThe online PSTN gateway is disabled.
- BAn SBC certificate is expired.
- CAn external DNS entry is missing from the FQDN of the SBC.
- DThe phone numbers of the users are defined by running the New-
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