VOIP over MPLS only

No. Voip is "just ip" - but if you expect to get overloads on theWAN (which you should) then you need some sort of voice traffic priority to control what happens.

FWIW i have a customer who has seriously fast WAN links - and although they are planning to use QoS to handle their Voip traffic, it has worked fine so far in a few ad hoc tests.

what you need is a network that can support QoS, and a way to make sure you dont send too much Voip down any one link.

However with F/R or ATM the routers at the edge of the cloud have to control traffic flow to give priority to voice, and limit traffic so that you dont get lots of queuing delay or loss of Voip packets.

exactly the same is true if you go for point to point serial links.

What you will find is if you want a layer 3 managed service with embedded QoS then MPLS is now the typical way to get it - as long as your provider supports it.

The other way of looking at it is that this is all he could sell where the service description even mentions Voip.....

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You may wish to investigate Chapter 2, MPLS TE Technology Overview:

Santiago Alvarez, CCIE No. 3621, who focuses on MPLS and QoS technologies within the Cisco IOS Technology Group:

Sincerely,

Brad Reese BradReese.Com - Cisco Network Engineer Directory

Hendersonville Road, Suite 17 Asheville, North Carolina USA 28803 USA & Canada: 877-549-2680 International: 828-277-7272 Fax: 775-254-3558 AIM: R2MGrant Website:

And what kind of access to this MPLS network is the sales guy pushing? VoIP is just that - over IP. Given appropriate b/w, low enough latency and erroring, it is irrelevant.