Inbound PSTN calling is currently supported in GA for Dynamics Omnichannel with phone numbers provided by Microsoft (Direct Offers) and phone numbers supplied by Direct Routing.
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Setup inbound PSTN calling with Dynamics Omnichannel - in General Availability, follow the instructions here
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To setup inbound PSTN calling with Power Virtual Agents - Coming soon
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To setup inbound PSTN calling with ACS Calling SDK's - Coming soon
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Customers taking part of Azure Bot Framework Telephony Channel preview can find the instructions here