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.
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