Method for automatic wireless replenishment using DTMF

摘要

The invention provides a method for replenishing call-use authorization to a mobile vehicle. A call-use authorization request is received from a user. User credit availability information is determined. A replenishment amount request is received from the user. Call-use authorization data is updated based on the credit availability information and the replenishment amount request. The updated call-use authorization data is sent to an in-vehicle communication device by using a dual-tone multiple frequency protocol.