MT.1042 - Restrict dial-in users from bypassing a meeting lobby

Contributed by Stefan Wey with 2 co-contributorsAll contributors →

Overview

Dial-in users should not be able to bypass the meeting lobby.

Dial-in users aren’t authenticated though the Teams app. Increase the security of your meetings by preventing these unknown users from bypassing the lobby and immediately joining the meeting.

This test checks the AllowPSTNUsersToBypassLobby setting of the Global (Org-wide default) Teams meeting policy.

Remediation action

1. Open Meeting policies in the Teams admin center.
2. Select the Global (Org-wide default) policy.
3. Set People dialing in can bypass the lobby to Off.
4. Select Save.

Or with PowerShell: Set-CsTeamsMeetingPolicy -Identity Global -AllowPSTNUsersToBypassLobby $false

Related links

• Manage meeting policies in Microsoft Teams - Microsoft Learn

Test Metadata

Field	Value
Test ID	MT.1042
Severity	Medium
Suite	Maester
Product	Teams
Feature	Meetings
Area	External access and sharing
Resource type	Tenant
User impact	Low
Implementation cost	Low
MITRE ATT&CK	None
Supports controls	nist-800-53-r5:AC-3
PowerShell test	Test-MtCheckMT1042
Services	Teams

Source

• Test: tests/maester/teams/Test.MT.1042.ps1
• Documentation: tests/maester/teams/Test.MT.1042.md