CoS, ToS, QoS work on the information units queued in a buffer of a device.
I think that, in the same way of a circuit switched network, an
establishment phase could exist. In this phase the network could reserve the
right resources.
i.e. virtual circuit, bandwidth, ....
Thanks.
----- Original Message -----
From: "Mike S" <ietf(_at_)flatsurface(_dot_)com>
To: "Daniele Giordano" <d(_dot_)giordano(_at_)fastpiu(_dot_)it>
Cc: <ietf(_at_)ietf(_dot_)org>
Sent: Monday, March 28, 2005 1:40 PM
Subject: Re: reduce jitter in routed network for voip applications
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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