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

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Motivations, Drivers, Approaches, and Advantages of VoMPLS
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Again, there is ongoing work on standardizing such coordination Design goals for defining this coordination include telephony user expectations of behavior after the phone is ringing, minimization of post-dial delay, charging aspects, denial of services, and so on The Internet Draft Architectural Considerations for Providing Carrier Class Telephony Services Utilizing SIP-Based Distributed Call Control Mechanisms provides a more detailed discussion on such coordination in the context of the Distributed Call Signaling (DCS) architecture38 The Internet Draft Integration of Resource Management and SIP for IP Telephony provides an example of how SIP signaling can be coordinated with IP QoS bearer control signaling30 As another example, ITU-T SG 16/Q13 has been submitted into ITU SG 16 defining how H323 signaling with slow start can be coordinated with RSVP39 One potential approach for controlling VoIPoMPLS network elements to enable QoS and GoS guarantees to be made is via the emerging MPLS policy model28 In this model, abstract policy rules may be used to define and control the QoS assigned to a particular session or groups of sessions Available network resources are brokered by a management layer consisting of one or more Policy Decision Points (PDPs) that effectively act as bandwidth brokers The PDPs pass policy rules to the MPLS network elements that trigger the generation (or deletion) of LSPs Such LSPs can be used as preprovisioned aggregate traffic trunks thereby providing a mechanism for achieving GoS within a VoIPoMPLS network The control of individual sessions is achieved by adding or deleting associated filters to the aggregated LSPs The PDPs perform a bandwidth broker function to determine whether the session can be accepted and if so, they determine its optimal route To achieve scaling, it may be advantageous to have this functionality distributed and therefore have an interbandwidth broker signaling mechanism that is capable of passing LSP control information
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Policy-Based Control of VoIPoMPLS Network Elements Bearer Control for VoIPoMPLS
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Concept of VoIPoMPLS Bearer Control Let s consider a VoIPoMPLS gateway that is, a gateway that incorporates both the VoIP function and the IP/MPLS IWF, and thus is capable of transmitting packetized VoMPLS Before packetized voice can be transmitted over an MPLS LSP, the LSP must be established via a label-binding protocol Since we focus on environments where quality is to be guaranteed to voice calls, the LSP must be established with resource reservation and QoS attributes The LSP may also be established along a path determined by constraint-based routing to meet these QoS attributes Also, if header compression and multiplexing
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are performed over the LSP, the compression and multiplexing contexts must be established over the LSP Thus, the VoIPoMPLS bearer control function can be seen as responsible for the establishment of connectivity (possibly with constraint-based routing), QoS and resource reservation, and a compression/multiplexing context VoIPoMPLS Bearer Control for Connectivity RSVP17 and CR-LDP18 can be used as the bearer control protocols to perform LSP setup and corresponding label binding If constraint-based routing is to be performed at the granularity of gateway-to-gateway pair, constraint-based routing can be performed at LSP setup so that RSVP or CR-LDP establishes the LSP along the computed path If fast reroute is to be performed at the granularity of gateway-togateway pair, fast reroute can be requested at LSP setup by RSVP or CR-LDP VoIPoMPLS Bearer Control for QoS and Resource Reservation Resource reservation and QoS establishment can also be performed by RSVP and CR-LDP Clearly, they can be performed simultaneously with the LSP establishment (VoIPoMPLS bearer control for connectivity) and can use the same signaling messages simply augmented with the appropriate QoS-related information elements The QoS bearer control function for VoIPoMPLS is identical to the IP QoS bearer control discussed earlier for VoIP gateways Consequently, all the ongoing work in the IETF pertaining to IP QoS bearer control for VoIP is applicable to VoIPoMPLS as one possible approach This includes
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Solutions for advertisement and negotiation of traffic parameters and QoS bearer control requirement in call control protocols, as discussed previously in the section The Advertisement/Negotiation of Traffic Parameters and IP QoS Bearer Control Requirement in Call Control Solutions for QoS bearer control signaling, as discussed previously in the section Signaling for IP QoS Bearer Control Establishment Solutions for coordination between call control and QoS bearer control, as discussed previously in the section Coordination Between Call Control and IP QoS Bearer Control
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VoIPoMPLS Bearer Control for Compression/Multiplexing The establishment of a compression and multiplexing context is one aspect of VoIPoMPLS bearer control RSVP and CR-LDP may also be used to signal the corresponding information As an example, details of how RSVP can be used to signal the compression and multiplexing context for simple header compression are provided in the Internet Draft Simple Header Compression 13 We note then that all aspects of bearer control (connectivity,
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