The present systems of control based on polling by radio frequency must evolve to be able to carry advanced telecommunication services, such as capture and multimedia information management as well as control information. In this paper a supervision and control system based in public networks that complements a classic polling system allowing to incorporate new information services and eliminating the typical long delays of these kinds of systems is described. Two alternatives of communication are evaluated, point to point connections and Virtual Private Networks, VPNs/IP on ISDN, for the interconnection of the stations and the control center. For this, images are transmitted as well as the control information through both types of connection, the throughput of the transmission is evaluated and its behavior is observed. Compression techniques are used and the different parameters that can influence the compressed image quality are analyzed. The viability of this type of solution in the proposed scenarios is demonstrated.