A Session Management Function, SMF, of a mobile radio communication network, comprising one or more processors configured to: receive a steering request message (S10) via a Network Exposure Function, NEF, and/or Policy Control Function, PCF, the steering request message (S10) requesting to establish a communication connection (S20, S22) between a first Application Function, AF, and a second AF , for steering the traffic of a Protocol Data Unit, PDU, session between a User Equipment, UE, and the first AF to the second AF , wherein the first AF and the second AF are located outside the mobile radio communication network, the steering request message (S10) comprising a first information allowing the determination of a first interface associated with a first network in which the first AF is located, a second information allowing the determination of a second interface associated with a second network in which the second AF is located, and an address of the UE ; establish the communication connection between the first AF and the second AF through the mobile radio communication network and via the first interface and via the second interface using the first information and/or the second information; wherein the first information of the steering request message (S10) comprises a Data Network Access Identifier, DNAI, of a first User Plane Function associated with the first network; and/or wherein the second information of the steering request message (S10) comprises a DNAI of a second User Plane Function associated with the second network; and/or wherein the first information of the steering request message (S10) comprises a first AF Service identifier, ID, of the first AF ; and/or wherein the second information of the steering request message (S10) comprises a second AF Service ID of the second AF. receive a steering request message (S10) via a Network Exposure Function, NEF, and/or Policy Control Function, PCF, the steering request message (S10) requesting to establish a communication connection (S20, S22) between a first Application Function, AF, and a second AF , for steering the traffic of a Protocol Data Unit, PDU, session between a User Equipment, UE, and the first AF to the second AF , wherein the first AF and the second AF are located outside the mobile radio communication network, the steering request message (S10) comprising a first information allowing the determination of a first interface associated with a first network in which the first AF is located, a second information allowing the determination of a second interface associated with a second network in which the second AF is located, and an address of the UE ; establish the communication connection between the first AF and the second AF through the mobile radio communication network and via the first interface and via the second interface using the first information and/or the second information; wherein the first information of the steering request message (S10) comprises a Data Network Access Identifier, DNAI, of a first User Plane Function associated with the first network; and/or wherein the second information of the steering request message (S10) comprises a DNAI of a second User Plane Function associated with the second network; and/or wherein the first information of the steering request message (S10) comprises a first AF Service identifier, ID, of the first AF ; and/or wherein the second information of the steering request message (S10) comprises a second AF Service ID of the second AF. <EOS>