Device and method for call diversion in telecommunication networks

The invention relates to a method for call diversion in a telecommunication network, comprising a data network (1), a voice network (2), for the transmission of speech, a network server (7), for the speech network (2) and a management server (6), for the data network (1). According to the invention, the management server is interrogated about the state of a call from the user terminal (8) to the data network (1) and where an error in said call occurs a call transfer to a stored address is carried out by the network server (7).