nanog mailing list archives
Re: VoIP QOS best practices
From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Mon, 10 Feb 2003 23:23:15 +0000 (GMT)
On Tue, 11 Feb 2003, Petri Helenius wrote:
Reordering per se doesn't affect VoIP at all since RTP has an inherent resync mechanism.Most VoIP implementations don´t care about storing out-of-order packets because they think that 20ms or 30ms late packets should be thrown away in any case.Reordering is also unlikely, since each packet is sent 20ms or more apart; I'm not aware of any network devices that reorder on that scale.Most "core" routers, at least from vendors C and J have enough packet memory to keep packets for hundreds of milliseconds. Apply sufficent
Really.. including many Gigabit, OC-12,48 interfaces
per packet load balancing (which would be stupid but doable) to this, and you´ll arrive at the end result.
And its unlikely you will be doing this therefore..
Our observations tell us that reordering does not happen too much but there are periods from a few minutes to an hour where reordering from specific AS´s skyrocket to return to normal, in many cases even without observable path change. (MPLS in action?) Pete
Current thread:
- RE: VoIP QOS best practices, (continued)
- RE: VoIP QOS best practices Ray Burkholder (Feb 10)
- Re: VoIP QOS best practices Kurt Erik Lindqvist (Feb 10)
- RE: VoIP QOS best practices Shawn Solomon (Feb 10)
- RE: VoIP QOS best practices Ray Burkholder (Feb 10)
- RE: VoIP QOS best practices Spencer . Wood (Feb 10)
- RE: VoIP QOS best practices Ray Burkholder (Feb 10)
- RE: VoIP QOS best practices Ray Burkholder (Feb 10)
- Re: VoIP QOS best practices Stephen Sprunk (Feb 10)
- Re: VoIP QOS best practices Stephen Sprunk (Feb 10)
- Re: VoIP QOS best practices Petri Helenius (Feb 10)
- Re: VoIP QOS best practices Stephen J. Wilcox (Feb 10)
- Re: VoIP QOS best practices Petri Helenius (Feb 10)
- RE: VoIP QOS best practices Charles Youse (Feb 10)
- Re: VoIP QOS best practices Stephen Sprunk (Feb 10)
- Re: VoIP QOS best practices Stephen Sprunk (Feb 10)
- Re: VoIP QOS best practices Eric Gauthier (Feb 11)
- Re: VoIP QOS best practices Stephen Sprunk (Feb 10)
- RE: VoIP QOS best practices Ray Burkholder (Feb 10)