A new setting is becoming available for Teams meeting policies to control how dial-in users are handled when joining the meeting.

With this new setting, dial-in users are bypassing the lobby by default.

You can control it by editing the Allow dial-in users to bypass the lobby setting in the meeting policy from the portal

or by using the Teams PowerShell module by turning on or off the AllowPSTNUsersToBypassLobby parameter

NOTE the meeting policy CMDlet’s are available with the Skype for Business PowerShell module (available here https://www.microsoft.com/download/details.aspx?id=39366)

Import-Module SkypeOnlineConnector

$sfbSession = New-CsOnlineSession

Import-PSSession $sfbSession

Set-CsTeamsMeetingPolicy –Identity <Teams Meeting Policy> –AllowPSTNUsersToBypassLobby $true or $false