VoIP service QoS guarantee measures is the current industry to explore the most popular topics, IETF (Internet Engineering Task Force) suggested several kinds of supporting QoS technology solutions, mainly include: integrated service (Int - serv)/resource reservation protocol (RSVP), services (DiffServ), multi-protocol label switching (MPLS), a business Traffic Engineering, Traffic Engineering), such as telecom operators according to the characteristics of the network itself also adopted some measures to RSVP protocol appeared, then to achieve widespread approbation, generally is considered to solve the problem of resource reserved, but as a result of achieving an RSVP is very complex, so this strategy in practice and is difficult to promote,
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