ClutchCall Voice Control-Plane API
Control-plane API for the call lifecycle (originate, get, transfer, hangup), keyed off call_sid. Per the docs it is exposed through the Voice SDK (ClutchCallClient) as typed control-plane RPCs (voice.calls.*) over QUIC; there is no hand-written REST surface and no published OpenAPI. SDK examples point at https://engine.clutchcall.dev.