On Thu, Nov 23, 2006 at 11:10:36AM -0600, Mike Hammett wrote: > I know how the Internet works. I'm about to get my own AS for 7 sites in > the US and 2 in the EU with more to come. > If both endpoints share a common ISP, its ALMOST as good as having a > private IP link. The data does not cross peering points and your provider > is solely responsible for the quality of the traffic. Better than that is > to purchase layer 2 services available from MANY providers. If you get > your own AS, you can then peer with your VoIP partners as well as one or > more transit providers. This then provides a failover if your private link > goes down. IP connections can be made much more fault tolerant than TDM > connections at a much lower cost.
AS numbers mean nothing, they mean you can run routing protocols such as BGP and set the metrics for how traffic should pass to other AS numbers and IP networks (and who you trust). The only way to guarantee that traffic has QoS is to make sure it goes into a network that supports QoS and the metrics have been set correctly so your type of traffic will pass across the network correctly. You can purchase L2 services, which may be genuine L2 or encapsulated L2 within a L3 network. If you connect to an ISP at two points, unless they guarantee QoS across their own network, there's likely to be congestion somewhere in their network. Major providers do provide QoS in IP using IP/MPLS (or other protcols). Currently the only real way to ensure zero congestion at peering points is to purchase enough capacity at the exchange so congestion can never occur (and then onward through the exchange point). Eventually more exchanges supporting QoS will appear, but then everyone connecting will have to support the same QoS metrics for it to be meaningfull. The whole reason IP networks are more resilient is that they support dynamic routing, which is exactly what you don't want for VoIP type traffic. </end rant> Steve -- NetTek Ltd UK mob +44-(0)7775 755503 UK +44-(0)20 79932612 / US +1-(310)8577715 / Fax +44-(0)20 7483 2455 Skype/GoogleTalk/AIM/Gizmo/Mac stevekennedyuk / MSN [EMAIL PROTECTED] Euro Tech News Blog http://eurotechnews.blogspot.com _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
