nanog mailing list archives
Re: VoIP QOS best practices
From: "Petri Helenius" <pete () he iki fi>
Date: Tue, 11 Feb 2003 00:51:23 +0200
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 per packet load balancing (which would be stupid but doable) to this, and you´ll arrive at the end result. 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 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)