A communication method in a communication network from a first user device to a target partner device, the method comprising the steps of - performing authorisation management with respect to the user devices taking part in a communication session for establishing a communication connection, - performing mutual registration and validation between the first user device initiating the communication session and the target partner device, - establishing a communication route to the target partner device not reachable by direct addressing by by-passing a node blocking a direct connection, - setting up a personal TURN server at one or more user devices of the communication network in response to a definite and pre-granted request or in advance, - implementing the communication route to be established via at least one mentioned personal TURN server, characterized by the steps of - creating a common secret between the first user device and the personal TURN server assigned to it, - mutually identifying the first user device and the personal TURN server, - temporarily replacing a password of the first user device for the personal TURN server by a complex password generated by the server with the help of a ticket-requesting solution TGT, - identifying the first user device with the help of TGT, - creating common secrets between the first user device and the target partner device, - checking that entered common secret passwords defined or generated by the first user are identical at the first user device and the target partner device, - requesting a permission for using the personal TURN server from the target partner device, - in case of granting the permission, creating a Kerberos ticket comprising the permission parameters encrypted with the temporary password and the TGT of the first device, - after granting the permission, addressing the personal TURN server by the target partner device with said ticket for performing the communication, and implementing the steps listed above for the personal TURN server in a personal computer, PC, of the size of a USB dongle attachable to any device with a USB port. - performing authorisation management with respect to the user devices taking part in a communication session for establishing a communication connection, - performing mutual registration and validation between the first user device initiating the communication session and the target partner device, - establishing a communication route to the target partner device not reachable by direct addressing by by-passing a node blocking a direct connection, - setting up a personal TURN server at one or more user devices of the communication network in response to a definite and pre-granted request or in advance, - implementing the communication route to be established via at least one mentioned personal TURN server, - creating a common secret between the first user device and the personal TURN server assigned to it, - mutually identifying the first user device and the personal TURN server, - temporarily replacing a password of the first user device for the personal TURN server by a complex password generated by the server with the help of a ticket-requesting solution TGT, - identifying the first user device with the help of TGT, - creating common secrets between the first user device and the target partner device, - checking that entered common secret passwords defined or generated by the first user are identical at the first user device and the target partner device, - requesting a permission for using the personal TURN server from the target partner device, - in case of granting the permission, creating a Kerberos ticket comprising the permission parameters encrypted with the temporary password and the TGT of the first device, - after granting the permission, addressing the personal TURN server by the target partner device with said ticket for performing the communication, and implementing the steps listed above for the personal TURN server in a personal computer, PC, of the size of a USB dongle attachable to any device with a USB port.