Microsoft Calling Plans

You may want a Microsoft Calling Plan if it is available in your region and you have no desire to retain your current PSTN carrier.

With this option you get Phone System with added Domestic or International Calling Plans that allow calling to phones around the world (depending on the level of service being licensed). Calling Plan operates out of Microsoft 365 so You wont require deployment or maintenance of an on-premises deployment.

You can connect a supported Session Border Controller (SBC) through Direct Routing for working with third-party PBXs, analog devices, and other equipment. This option requires uninterrupted connection to Microsoft 365 so be sure to look into upgrading your network and connectivity options.