A method for initiating a call in an in-transparent communication network between a first signaling entity (Endpoint A) and a second signaling entity (Endpoint B) each connected to a node (Node 1, Node 2) and the nodes (Node 1, Node 2) connected to a network wherein communications between the signaling entities (Endpoint A, Endpoint B) and the nodes (Node 1, Node 2) is conducted using a first protocol (Prot X, Prot SIP) and communications are carried over the network using a second protocol (Prot Y, QSIG), the first protocol (Prot X, Prot SIP) being different than the second protocol (Prot Y, QSIG), comprising: sending a request for call setup using the first protocol (Prot X, Prot SIP) from a first signaling entity (Endpoint A) to a first node (Node 1); converting the request for call setup from the first protocol (Prot X, Prot SIP) to the second protocol (Prot Y, QSIG) in the first node (Node 1); sending the call setup request converted into the second protocol (Prot Y, QSIG) from the first node (Node 1) via a network to a second node (Node 2) that is connected to a second signaling entity (Endpoint B); and converting the call setup request received from the first node (Node 1) from the second protocol (Prot Y, QSIG) to the first protocol (Prot X, Prot SIP) in the second node (Node 2); characterized by the steps: establishing a separate connection between the first node (Node 1) and the second node (Node 2) over which communications are sendable using the first protocol (Prot X, Prot SIP); the second node (Node 2) requesting data from the call setup request in the first protocol (Prot X, Prot SIP) sent by the first signaling entity (Endpoint A) to the first node (Node 1) from the first node (Node 1) via the separate connection; the first node (Node 1) sending information concerning the data from the call setup request in the first protocol (Prot X, Prot SIP) sent by the first signaling entity (Endpoint A) to the second node (Node 2) via the separate connection; transmitting messages between the first node (Node 1) and the second node (Node 2) via the separate connection using the first protocol (Prot X, Prot SIP); the first node (Node 1) creating correlation data which identify the first node (Node 1); and sending the correlation data to the second node (Node 2) through the network together with the call setup request using the second protocol (Prot Y, QSIG); wherein the second node (Node 2) requests, via the separate connection, the specific signaling information that contains all information elements of the first protocol (Prot X, Prot SIP) that was originally received by the first node (Node 1) and stored by the first node (Node 1), and in response, the first node (Node 1) sends that data in the first protocol (Prot X, Prot SIP) to the second node (Node 2) via the separate connection. sending a request for call setup using the first protocol (Prot X, Prot SIP) from a first signaling entity (Endpoint A) to a first node (Node 1); converting the request for call setup from the first protocol (Prot X, Prot SIP) to the second protocol (Prot Y, QSIG) in the first node (Node 1); sending the call setup request converted into the second protocol (Prot Y, QSIG) from the first node (Node 1) via a network to a second node (Node 2) that is connected to a second signaling entity (Endpoint B); and converting the call setup request received from the first node (Node 1) from the second protocol (Prot Y, QSIG) to the first protocol (Prot X, Prot SIP) in the second node (Node 2); establishing a separate connection between the first node (Node 1) and the second node (Node 2) over which communications are sendable using the first protocol (Prot X, Prot SIP); the second node (Node 2) requesting data from the call setup request in the first protocol (Prot X, Prot SIP) sent by the first signaling entity (Endpoint A) to the first node (Node 1) from the first node (Node 1) via the separate connection; the first node (Node 1) sending information concerning the data from the call setup request in the first protocol (Prot X, Prot SIP) sent by the first signaling entity (Endpoint A) to the second node (Node 2) via the separate connection; transmitting messages between the first node (Node 1) and the second node (Node 2) via the separate connection using the first protocol (Prot X, Prot SIP); the first node (Node 1) creating correlation data which identify the first node (Node 1); and sending the correlation data to the second node (Node 2) through the network together with the call setup request using the second protocol (Prot Y, QSIG);