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.contos

Question

Options

• AThe firewall blocks outbound traffic on port 443 to Microsoft Teams.
• BThe firewall blocks traffic to the signaling port on the SBC.
• CTLS 1.2 is enabled on the SBC.
• DMicrosoft 365 Phone System licenses are not assigned to the users.

• A
  4% (2)
• B
  72% (34)
• C
  9% (4)
• D
  15% (7)

Explanation

In a Direct Routing deployment, the SBC communicates with Microsoft Teams using SIP signaling over specific ports (typically 5061 for TLS-secured SIP). If a firewall is blocking inbound or outbound traffic on the SBC's signaling port, Teams cannot establish or maintain a proper SIP connection to the SBC, resulting in warning messages during troubleshooting. Port 443 blockage (A) would affect HTTPS/management traffic but not SIP signaling directly. TLS 1.2 (C) is required and its presence would not cause errors-disabling it would. Missing Phone System licenses (D) would prevent user calls but would not generate SBC-level signaling warnings.

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