Motivations, Drivers, Approaches, and Advantages of VoMPLS in C#

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Motivations, Drivers, Approaches, and Advantages of VoMPLS
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New sessions should be routed so that the network resources are used in an efficient manner This implies that the system needs to be capable of supporting traffic between the same two endpoints using multiple path alternatives The QoS guarantees for existing voice connections should be unaffected when new sessions are established when full, this implies a requirement that new session requests should be rejected if insufficient network resources are available The network should be resilient to mass calling events This implies that call rejection should be performed at the edge of the network to avoid placing undue load onto the core network routers
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The previous requirements imply that VoIPoMPLS systems should be constructed where the MIWF is aware of LSP usage and tracks bandwidth consumption, either using admission control to restrict new calls or creating new LSPs when bandwidth in an existing LSP is committed
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of procedures and policies that are applied to existing voice sessions to ensure that network congestion is minimized and controlled The following functions will typically be performed at this layer:
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Traffic buffering and queue management within MPLS routers to control delay (based on signaled QoS requirements, that is, not voice specific)
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Traffic shaping at ingress points to minimize the resource requirements of traffic sources Loss/late packet interpolation and jitter buffering at egress points to reconstitute the original real-time session stream Traffic measurement for performance monitoring and congestion detection
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VoIPoMPLS does not differ from other forms of voice over data networks in its dynamic traffic management capabilities other than in the fundamental properties MPLS provides Providing End-to-End QoS for Voice Using MPLS A key goal of the development of the VoIPoMPLS specification will be to ensure that the reference architecture is capable of supporting end-to-end QoS and GoS Defining new MPLS-related signaling protocols is out of the scope of VoIPoMPLS VoIPoMPLS may motivate some extensions to the existing protocols as required
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Traffic policing at key network ingress points to ensure session compliance to traffic contracts/service level agreements (SLAs)
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Dynamic Traffic Management Dynamic traffic management refers to the set
Five
The initial goal is to define an end-to-end QoS architecture for a single MPLS domain This implies that it should be possible to set up LSPs with a bandwidth reservation and a bounded delay A long-term goal is to achieve end-to-end QoS across multiple MPLS domains However, this will require considerable progress in the area of the generic MPLS specifications A connectivity model and end-to-end VoIPoMPLS reference connection is shown in Figure 5-21 The model provides a framework for the control and signaling required to establish QoS-capable sessions The reference model illustrated is scalable to global proportion, consisting of access domains and core network domains Figure 5-21 shows two core domains, which might, for example, represent the two national operators involved in establishing an international session The connectivity model may be devolved further to support multiple core MPLS domains The access domains can be provided either by the ISDN (requiring a TDM-to-packet
Figure 5-21 End-to-end reference connection
Gateway
Gateway
+ + + + +
+ + + + + + + + +
BC CC
+ + + + +
+ + + + + + +
BC CC // A
ISDN or MPLS Access
+ + +
+ + +
/ / MPLS Core Domain 1 Gateway
Gateway
ISDN or MPLS Access
+ + + + + +
B CC
+ + + +
+ + + +
+ + + + + + + +
/ BC
+ + + +
/ / MPLS Core Domain 2
BC = Bearer Control CC = Call Control
Motivations, Drivers, Approaches, and Advantages of VoMPLS
interworking function at the gateway to the core MPLS domain) or by an MPLS access network enabling full end-to-end VoIPoMPLS operation
564 Requirements for MPLS Signaling
LDP and CR-LDP This requirement has yet to be defined RSVP-TE This requirement has yet to be defined
565 Requirements for Other Work
This subsection lists the standardization items that are recommended for IETF and their associated requirements This includes the identification of the work item, the subsection in the draft describing the item details, and the Working Group where the work could be carried out Some possible items follow:
Solutions for the advertisement and negotiation of traffic parameters and QoS bearer control requirement in call control protocols (TEWG item ) Solutions for QoS bearer control signaling (MPLS WG item ) Solutions for coordination between call control and QoS bearer control (SIP, MEGACO, MPLS, or TEWG item ) Identify requirements, protocol, guidelines for QoS/GoS callcontrol/bearer-control coordination mechanisms for VoIPoMPLS (TEWG item ) Support of voice traffic engineering/constraint-based routing (TEWG item )
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