Abstract: The subject matter discloses a computerized apparatus (100) configured for coupling between network users, the apparatus comprising a receiver (110) configured for receiving a first coupling request from a first user to a second user; a processor (120) configured for searching for a second coupling request from the second user to the first user according to the addresses; a storage device (140) for storing in the buffer the first coupling request as a result of not finding the second coupling request; and a transmitter (130) for sending a coupling message to the first user and to the second user according to information stored in the buffer, as a result of finding the second coupling request.