An embedded modem for a vehicle is provisioned by requesting confirmation of the modem configuration from a telematics server. A request is received over a vehicle bus from an electronic control unit (ECU) requesting confirmation of an ECU configuration assigned by the end-of-line systems. The embedded modem sends the request to the telematics server for confirmation, and reports a result from the telematics server to the ECU. A telematics server receives a request to provision an ECU from an embedded modem of a vehicle that was provisioned using the telematics server, forwards the request to a backend system configured to process the request, receives a response to the request from the backend server, and makes the response available to the embedded modem.