System and methods provide acoustic echo monitoring and cancellation for real time media processing in an internet protocol media server in an IP network. The method is initiated in response to discovery of a new vulnerability. In addition, by using a pair of substrates which are thinned by performing grinding and polishing, a semiconductor device is provided, in which a compact size, a thin shape, and lightweight are achieved. The system also contains the ability to distinguish between signaling and data channel failures, as signaling channel failures to do not clear cross connect data but simply leave it \u201cownerless\u201d. The non-critical features are formed in the H-mask and the V-mask utilizing chrome. At least one of before and after the image forming operation, the bias controller applies the first bias to the first transfer electrodes without applying the second bias to between the developer holding body and the first transfer board, so as to transfer the development agent along the first developer transfer path without making the developer holding body hold the development agent.