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( votes)To add Voice Calling (PSTN – Public Switched Telephone Network) connectivity to an app or service, we can buy a number from Microsoft, which acts as a PSTN carrier (based on availability in the region). https://learn.microsoft.com/en-us/dynamics365/customer-service/voice-channel-region-availability#azure-direct-routing This is the easiest way to connect ACS (Azure Communication Services) to PSTN, managed by Microsoft. Here Microsoft will … Continue reading “How to – Set up Omnichannel Voice using Azure Communication Service (ACS)”