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Question 108 - MS-721 discussion
You have a Microsoft Teams Phone deployment.
You are deploying Direct Routing.
All users have a SIP URI in the format of [email protected]. The Session Border Controller (SBC) is named sbc.voice.contoso.com.
When troubleshooting errors on the SBC, you receive the warning shown in the following exhibit.
What is a possible cause of the issue?
A.
The firewall blocks outbound traffic on port 443 to Microsoft Teams.
B.
The firewall blocks traffic to the signaling port on the SBC.
C.
TLS 1.2 is enabled on the SBC.
D.
Microsoft 365 Phone System licenses are not assigned to the users.
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