Abstract: A method of a real time data communication via a real time data over communication network, including the steps of transmitting at least two packets from source to destination, and determining by the destination for each one of the at least two packets, time information related to a receiving time of the packet. The source applies a predefined packet length to each packet, and the destination determines, according to the determined time information and the packet length, the characteristics of a first relation between a packet length and a source to destination delay. The destination also determines a preferred mouth to ear delay according to a preferred quality rating for the data communication, and also determines an optimal packet length to be used by the source for the preferred mouth to ear delay and according to the characteristics of the first relation.

Abstract: The present invention discloses a method to have a real time data communication between a first user (U1) of a source (S) and a second user (U2) of a destination (DT) via a real time data over Internet Protocol communication network. The method comprises transmitting by a transmitting means (TR) of the source (S) at least two packets (T1, T2, T3, T4) to the destination (D), and determining by a receiving means (REC) of the destination (D) for each one (T2) of the at least two packets (T1, T2, T3, T4), time information (T2_t2) related to a receiving time (t2) of the packet (T2). The method further comprises applying by the transmitting means (TR) for each one (T2) of the packets (T1, T2, T3, T4) a predefined packet length (l2) out of a plurality of packet lengths (l1, l2, . . . , li) in order to be transmitted accordingly.