Set-Up of Media Stream Transmission and Server and Client for Media Stream Transmission

A network server device (12) for transmitting a media stream from the network server device (12) to a client device (10), the method comprising

• a first message handler (57a,b) for receiving a discovery message (44b) on a predetermined first port of the server device (12), the discovery message (44b) having a payload data field that contains a first identifier;
• a second message handler (55) for receiving a set-up request message (43b) having a payload data field that contains a second identifier from a second port of the server device (12),
• a media streamer (50) configured to transmit a media stream (48b) in accordance with selected transport parameters from a further port of the server device (12) to a selected destination port of the client device (10);
• a memory (53);
• a controller (52) coupled to the first and second message handler (55, 57a,b), the media streamer (50) and the memory (53), and configured to store information in the memory (63) recording that the discovery message (44b) has been received;
• to compare the first and second identifier of the received set up request message (43b) and the discovery message (44b) according to the information recording reception, at least when the discovery message (44b) has been received before the set-up request message (43b) and to respond to detection that the first and second identifier have matching values by controlling selection of the transport parameters and the destination port, based on the set-up request message (43b) and a source port identification from a source field of the discovery message (44b).

A computer program product comprising a program of instructions that when executed by a programmable processor of a server device (12), will cause the programmable processor to

• store information recording that a discovery message (43b) has been received by a first message handler (57a,b) of a predetermined first network port in a memory (53);
• receive a set-up request message (43b) from a second message handler (55) of a second network port;
• compare a first and second identifier from payload fields of the set up request message (43b) and the discovery message (44b) according to the information recording reception, at least when the discovery message (44b) has been received before the set-up request message (43b);
• and to
• respond to detection that the first and second identifier have matching values by controlling selection of transport parameters and a destination port of a media streamer (50), based on based the set-up request message (43b) and a source port identification from a source field of the discovery message (44b).