At 06:09 AM 3/28/2005, Daniele Giordano wrote... >RTP is transparent at the transport layer. We analyse TCP and UDP: >TCP is connection oriented and so the communication begins with the >definition of a virtual circuit. >A virtual circuit is a temporary connection of sequence nodes with relative >reservation of bandwidth. >A connection oriented service gives the certainty that all information units >use the same nodes with a same medium latency. >Same latency maintains reduced the jitter. That is incorrect unless _other_, stateful protocols (ex. RSVP, integrated services) are in use throughout the entire network. That is not the general case. IP routes on a per hop basis, whether TCP or UDP. There is no "virtual circuit" created, except at the endpoints. >I think that RTP should use a layer 4 connection oriented protocol (like >TCP) but without retransmissions of information units with excessive delay >or errors (like UDP). > >What do you think about this? You're trying to solve a problem which is incorrectly defined, and therefore doesn't exist. Diffserv already provides a QoS mechanism for VoIP and does not require gateways to maintain state for each connection. It, like Intserv, cannot be assumed to exist through any random Internet path. RFC2474, RFC2475. _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf