DiffServ & TE paths are required to deploy commercial VoIP over a MPLS net.

Dear members.
There's something I'd like to know from those that truly and successfully
implement commercial VoIP over a MPLS infrastructure.
Supporting IP QoS (DiffServ) across the core backbone and/or MPLS traffic-
engineered paths is really required ?
Consider a whole backbone built with high speed throughput connections, plenty of bandwidth availability and no periods of congestion!
I do believe TE tunnels (paths) are necessary for quick recovery when a node
or link fails, but rather them assuming something I haven't experienced yet
I'd like to listen from those who really have already successfully deployed
commercial VoIP.
Best regards.
Murilo Pugliese.

With increasing adoption of voice over IP (VoIP), the landscape for deployment is rapidly changing. Service providers are often driven by the need to provide customers a high grade of service to carry voice traffic across a network. However, today's multiservice packet networks rely on IP-based packet switching. In addition, IP by itself is simply best-effort service that is not sufficient to provide the strict delay, jitter, and bandwidth guarantees required for VoIP and other real-time traffic. Cisco IOS QoS features are ideal for this situation. Using the IETF differentiated services (DiffServ) model for QoS, VoIP traffic can be treated appropriately.
http://www.cisco.com/en/US/netsol/ns341/ns396/ns172/ns155/networking_solutions_white_paper09186a00800a8441.shtml

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