This new feature allows you to select the region from which you'd prefer to receive inbound calls. This only affects SIP Signaling, as Media Anchoring is handled by the Anchorsite feature.
Currently only IP auth and FQDN + IP auth Connections are available for this feature. To make use of it please edit your Connection and set your preferred Region under the Inbound Settings tab.
Current regions available are USA, Europe and Asia, with the option for Canada coming soon. You can read more here https://sip.telnyx.com.