All Microsoft 365 plans offer the ability for Microsoft Teams users to make peer-to-peer calls within the organisation using VoIP technology. However, if you want to make calls to PSTN numbers (landlines and mobiles), you'll need specific licenses. Operator Connect presents an option to enable PSTN calls from within your Microsoft Teams tenant, utilising our voice network while managing all the necessary connectivity and infrastructure as a cloud service.
For Operator Connect, you must have Microsoft Teams with either an E1, E3 license along with the Phone System add-on, or an E5 license. These licenses will grant you the capability to make PSTN calls seamlessly within Microsoft Teams.