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SIP trunk provisioning is currently managed from the OpenCX dashboard, not the public API. Use Settings → SIP to create inbound trunks, outbound trunks, and transfer destinations.
The previous SIP API examples documented /phone/sip/... endpoints that are not registered in the public API. They have been removed until SIP provisioning is exposed publicly.
For setup steps, see SIP Integration. After SIP is configured in the dashboard, the public Phone API can list your transfer destinations (GET /phone/transfer-destinations), attach them to a phone agent via transfer_destination_ids, create phone agents, and start outbound calls.