1. A method, comprising: determining, in a first network, an address associated with a called party of a second network, wherein the address is included in a session initiation protocol request; determining based on said address if said called party is in a trusted network, wherein the determining if the called party of the second network is in a trusted network comprises checking if the address is contained in a database of trusted networks, wherein the database is provided in at least one of a serving call session control function and a security gateway, and wherein the database is in the first network; and controlling a communication between the called party and a calling party of the first network based on whether said called party of the second network is in the trusted network, the communication comprising at least one message for the called party, wherein if the called party of the second network is not in the trusted network, the controlling comprises modifying the at least one message, wherein the controlling is performed by at least one processor.