correction of address type conflict in LibSip_Steps

        // current address to send TCP/UDP messages

        var SipUserProfile vc_userprofile; // PIXIT userinformation

        var address vc_sent_label; // removed because this value is predefined and used to open socket := {host := PX_SIP_SUT_IPADDR, portField := PX_SIP_SUT_PORT};

        var Address4SIP vc_sent_label; // removed because this value is predefined and used to open socket := {host := PX_SIP_SUT_IPADDR, portField := PX_SIP_SUT_PORT};

        // last incoming message

        var Response vc_response; // last incoming response message

        var boolean vc_boo_response := false; // to check if response received or not