MPLS Guaranteed Bandwidth Framework
Diffserv ensures that scheduling bandwidth is set aside on each link in the network for sub-pool traffic
DS-TE routing and admission control ensures that the sub-pool tunnel follows a path that has the needed BW in the LLQ / mDRR queues on every link
Per-VoIP-trunk policing at the edge ensures that the traffic directed onto the sub-pool tunnel is less than the capacity of the tunnel