Abstract: A method for reducing a call establishment time in real-time communication between at least two devices. The method includes: receiving, at a first internal server of a system, a first communication from a caller, wherein the first communication is a push request that comprises an attempt to initiate a connection with a callee; and sending a push notification via the first internal server to the callee, wherein the first internal server has at least two interfaces, wherein each interface of the at least two interfaces comprises a User Datagram Protocol (UDP) port, wherein the sending includes: embedding, by the first internal server and inside the push notification, an external UDP (IP, port) pair, of the at least two interfaces, to which the callee is able to connect.