A process for optimizing of the control of the traffic in a packet telecommunications network comprising at least one transmitter terminal, at least one receiver terminal, and a traffic regulator arranged between the transmitter terminal and the receiver terminal, said transmitter and receiver terminals exchanging data packet segments via a connection-oriented link employing a transport protocol with acknowledgement of receipt, process in which when a connection is made between the transmitter and receiver terminals, the packet segments sent from the transmitter terminal to the receiver terminal are intercepted at the level of the traffic regulator, an anticipated acknowledgement of receipt ACK a is generated to simulate receipt of said packet segments by the receiver terminal when the traffic regulator transmits the intercepted packets to said receiver terminal, then, - said anticipated acknowledgement of receipt ACK a is transmitted to the transmitter terminal so as to slave the sending rate of the packet segments by the transmitter terminal at a rate fixed by said traffic regulator, a process further characterised in that it comprises the steps consisting of: - estimating the value BDP representing the product of the bandwidth available by the transfer period (RTT, Round-Trip Time) of the packet segments between the traffic regulator and the receiver terminal, - calculating the value adv_wnd representing the optimal receiving window by the receiver terminal of the packet segments sent by the transmitter terminal by means of the following formula: adv_wnd = min rcv_wnd − pipe_size, bdp_estim where, • rcv_wnd illustrates a receipt window imposed by the receiver terminal, • pipe_size illustrates the number of octets not yet acknowledged by the receiver terminal, or an estimation of this number. • bdp_estim illustrates the estimated value of the product BDP. - transmitting to the transmitter terminal the calculated value adv_wnd so as to control the length of the bursts sent by said transmitter terminal. - said anticipated acknowledgement of receipt ACK a is transmitted to the transmitter terminal so as to slave the sending rate of the packet segments by the transmitter terminal at a rate fixed by said traffic regulator, a process further characterised in that it comprises the steps consisting of: - estimating the value BDP representing the product of the bandwidth available by the transfer period (RTT, Round-Trip Time) of the packet segments between the traffic regulator and the receiver terminal, - calculating the value adv_wnd representing the optimal receiving window by the receiver terminal of the packet segments sent by the transmitter terminal by means of the following formula: adv_wnd = min rcv_wnd − pipe_size, bdp_estim where, • rcv_wnd illustrates a receipt window imposed by the receiver terminal, • pipe_size illustrates the number of octets not yet acknowledged by the receiver terminal, or an estimation of this number. • bdp_estim illustrates the estimated value of the product BDP. • rcv_wnd illustrates a receipt window imposed by the receiver terminal, • pipe_size illustrates the number of octets not yet acknowledged by the receiver terminal, or an estimation of this number. • bdp_estim illustrates the estimated value of the product BDP. - transmitting to the transmitter terminal the calculated value adv_wnd so as to control the length of the bursts sent by said transmitter terminal.