Tom Talks Microsoft Teams and Microsoft 365 Collaboration news and opinions

Skype for Business Online Microsoft PSTN Conferencing behaviour change, at least one authenticated user required for PSTN dial out


A change in the way Skype for Business Online with Microsoft PSTN Conferencing behaves. Today, meeting guests (unauthenticated users) are able to add people to the meeting by dialling out to them via PSTN, even if no company authenticated users are in the meeting. This is curious as it could lead to anyone joining the bridge (discovering a meeting URL for example), dialling out and incurring a cost to either the customer or Microsoft depending on the outbound number called.

Going forward, In order to add other participants via dial-out to the meetings of your organization, at least one authenticated user from the same organization as the organizer (your organization) is required to be present in the meeting in other to allow adding other participants via dial-out. Therefore someone can be linked to the activity.

This change is being made in a matter of days by the sounds of the message. Another example of pretty short notification to service change in the cloud. Granted this doesn’t feel like a change that will impact many, and I think it’s quite sensible, but still shows the pace Microsoft are setting with changes in the cloud.


About the author

Tom Arbuthnot

A Microsoft MVP and Microsoft Certified Master, Tom Arbuthnot is Principal Solutions Architect at Microsoft Collaboration specialists Modality Systems.

Tom stays up to date with industry developments and shares news and his opinions on his blog, Microsoft Teams Podcast and email list. He is a regular speaker at events around the world.

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Tom Talks Microsoft Teams and Microsoft 365 Collaboration news and opinions