control protocol mgcp possibly adapted to proprietary requirements is used as an alternative communication between the controllers mgc a and mgc b and the media gateways mg a and mg b can also take place by means of the h 248 protocol standardized by the itu international telecommunications union signaling between the two controllers mgc a and mgc b is done by means of the bicc cs2 protocol as an alternative an isup protocol adapted to proprietary requirements isup or the sip t session initiation protocol can be used to exchange signaling information between ssp and scp the inap protocol extended for changing address information is used the itu publications q 762 and q 763 and the designs for q 763 addendum and q 765 show that in the isup and the bicc based on the isup the connection set up is initiated by means of a connection set up message iam initial address message which comprises a parameter filed app application transport parameter address information to be changed is extracted from the parameter field app of an incoming initial address message iam arriving in the controller mgc a this information is then transmitted to the scp of the controller in the text which follows the sequence of the method according to the invention is explained with the example of a connection set up for the sake of simplicity it is assumed that only ip addresses are changed other address information for example port addresses would be changed analogously during the connection set up the two media gateways mg a and mg b are supplied with destination addresses for transmitting payload data packets the connection is set up by means of an iam initial.