The DCC of automobile 4S shop refers to DialControlCenter, which is the so-called dial control center. Is a team responsible for sales, database management, opening up the sales market and tapping customer needs. The main task of DCC is to establish the corresponding connection according to the data transmission requirements, establish the connection in advance across the public switching network through the router, and establish it through dialing. When working, DCC will set up two lines, one is the main line and the other is the backup line to ensure the stability of communication.