Method for the transfer of data of a message subdivided in fragments from a first intermediary electronic processing unit to a second intermediary electronic processing unit, wherein the message is a video file or a numerical calculus file: wherein before the transfer, said first intermediary electronic processing unit receives said data encapsulated in the payload of data packets of the TCP type from a sender electronic processing unit through a telematic network, in particular the Internet, and decapsulates them; wherein after the transfer, said second intermediary electronic processing unit encapsulates said data in the payload of data packets of the TCP type and transmit them to a recipient electronic processing unit through a telematic network, in particular the Internet; wherein the transfer from said first intermediary electronic processing unit to said second intermediary electronic processing unit takes place by means of transmission and reception of data packets of the UDP type through a telematic network corresponding to the Internet, said data being encapsulated in the payload of said data packets of the UDP type; characterized in that said first intermediary electronic processing unit further inserts in the payload of said data packets of the UDP type: - a first data field containing an identifier of a connection between said sender electronic processing unit and said recipient electronic processing unit used to transfer said message - a second data field containing an identifier of said message - a third data field containing a number that identifies the position of a fragment within said message in terms of the number of fragments preceding said fragment in said message. wherein before the transfer, said first intermediary electronic processing unit receives said data encapsulated in the payload of data packets of the TCP type from a sender electronic processing unit through a telematic network, in particular the Internet, and decapsulates them; wherein after the transfer, said second intermediary electronic processing unit encapsulates said data in the payload of data packets of the TCP type and transmit them to a recipient electronic processing unit through a telematic network, in particular the Internet; wherein the transfer from said first intermediary electronic processing unit to said second intermediary electronic processing unit takes place by means of transmission and reception of data packets of the UDP type through a telematic network corresponding to the Internet, said data being encapsulated in the payload of said data packets of the UDP type; characterized in that said first intermediary electronic processing unit further inserts in the payload of said data packets of the UDP type: - a first data field containing an identifier of a connection between said sender electronic processing unit and said recipient electronic processing unit used to transfer said message - a second data field containing an identifier of said message - a third data field containing a number that identifies the position of a fragment within said message in terms of the number of fragments preceding said fragment in said message. - a first data field containing an identifier of a connection between said sender electronic processing unit and said recipient electronic processing unit used to transfer said message - a second data field containing an identifier of said message - a third data field containing a number that identifies the position of a fragment within said message in terms of the number of fragments preceding said fragment in said message.