end-to-end
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... While many in the telephony community assume that commercial VoIP
service in the Internet awaits effective end-to-end QoS, in reality
voice ...
... QoS on their backbones, and some corporate intranets offer end-to-end
QoS internally, end-to-end ...
... this occasional deployment to continue. This document expresses our
concern over the lack of effective end-to-end congestion control for
this best-effort voice ...
... However, these local forms of QoS are not directly visible to the
end-to-end VoIP connection. A best-effort VoIP ...
... VoIP connection could
experience high end-to-end packet drop rates, and be competing with
other best-effort traffic, even if some of the links ...
... voice traffic
that does not practice end-to-end congestion control. This document
raises some concerns about fairness ...
... 2914 already makes the point that best-effort
traffic requires end-to-end congestion control [RFC2914]. Because
...
... audio traffic doesn't
require end-to-end congestion control. Thus, while the concerns in
this document are general, the document focuses on the particular
...
... congestion. It is important to avoid congestion collapse along
the entire end-to-end path, including along the access links (where
congestion ...
... downstream). So an over-provisioned core does not by itself
eliminate or reduce the need for end-to-end congestion avoidance and
control.
...
... traffic in the
Internet, the only alternative is the use of end-to-end congestion
control. This is important even if end-to-end congestion control ...
... Internet, the only alternative is the use of end-to-end congestion
control. This is important even if end-to-end congestion control is
invoked only in those very rare scenarios with congestion ...
... congestion typically found on lower-
capacity access links, and to the use of end-to-end congestion
control in TCP. Most of the traffic ...
... VoIP traffic should be exempt from
end-to-end congestion control due to any claims of inherently more
valuable content. (One could equally logically argue that because
...
... start
sending again, to see if the congestion on the end-to-end path has
changed. This issue has been addressed in a proposal for
Probabilistic Congestion Control ...
... exhibit greater loss sensitivity at lower data rates. Lower-data
rate codecs maintain more end-to-end state and as a result are
generally more sensitive to loss.
...