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56 VoIPoMPLS
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This section, which is based on the Internet Draft draft-kankkunenvompls-fw-01txt,10 provides an early-view framework for using MPLS as an underlying technological alternative for transporting VoIP-based public voice services The document defines a reference model for VoIPoMPLS, defines some specific applications for VoIPoMPLS, and identifies potential further standardization work that is necessary to support these applications The annexes of the reference model discuss the types of requirements that voice services place on the underlying transport infrastructure The majority of this section has been selected from draft-kankkunen-vompls-fw01txt10 Many parts of this Internet Draft have been reprinted here for this discussion
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561 Introduction
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The purpose of the draft-kankkunen-vompls-fw-01txt document is to provide a common reference point for the operation of VoIP where MPLS is used in part or the entire IP network and identify any necessary related standardization work (In this document, we refer to VoIP over MPLS as VoIPoMPLS )
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Solutions for coordination between call control and QoS bearer control
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The voice encapsulation used in VoIPoMPLS is voice/RTP/UDP/IP/ MPLS Header-compression techniques can be used for making the transport of RTP/UDP/IP headers more efficient Thus, VoIPoMPLS does not mean that the RTP/UDP/IP headers must be physically transmitted The headers can be compressed, but must be reconstructible at the egress of the MPLS cloud Such header compression has been adopted as a work item in the MPLS Working Group (The MPLS Working Group charter states, 11 Specify standard protocols and procedures to enable header compression across a single link as well as across an LSP ) Possible header-compression mechanisms are defined in the Internet Drafts MPLS/IP Header Compression and Simple Header Compression 12,13 The purpose of the header compression is to define a way to create LSPs that carry voice efficiently The basic format of packets in the LSP should be a compressed header form of IP/UDP/RTP, with trivial conversion to and from real IP/UDP/RTP Voice LSPs should optionally support multiplexing within the LSP (multiple channels per LSP), which should be a minor extension to this compressed header LSPs should be able to be created with a constrained delay characteristic Two different alternatives for providing this kind of QoS are presented: 1 One solution is to rely on IP QoS end to end If IP is transported over MPLS, the IP QoS is mapped to the MPLS QoS and MPLS features such as traffic engineering can be used over the MPLS cloud 2 A second scenario is one where MPLS is used in both the access and collector portion of the network as well as the core Under this scenario, a QoS control mechanism that is MPLS aware is advantageous, utilizing MPLS TE to establish an optimal route across multiple (alternate) MPLS LSPs One purpose of this effort is to enable session-switched services from IP terminals that achieve the same QoS characteristics for real-time media as is currently available on ISDN and B-ISDN networks This draft consists of three main sections: (i) the VoIPoMPLS reference model, (ii) VoIPoMPLS applications, and (iii) the definition of the required VoIPoMPLS standardization work Section 562 defines a reference model for VoIPoMPLS Section 563 defines applications where MPLS can be the enabling technology for supporting voice in an IP infrastructure Sections 564 and 565 define the new VoIPoMPLS-related standardization that needs to take place in order to support the applications defined in Section 563 within the reference model of Section 562 The draft under discussion identifies new application-specific requirements that are not addressed by existing work These requirements include the following:
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Motivations, Drivers, Approaches, and Advantages of VoMPLS
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I I I I I I
Service types for carrying voice services over packet networks should be defined (This is not an MPLS-specific issue) Explicit quantitative guidelines each service type sets on the parameters described in Annex B should be defined Identify how the quantitative guidelines are mapped to MPLS LSPs in both diffserv and non-diffserv environments Mechanisms for using MPLS for providing GoS required by the various service types need to be defined The reduction of header overhead and the support of efficient multiplexing of multiple voice calls over a single LSP The reduction of header overhead and the support of multiplexing using link-level techniques
MPLS is being introduced into IP networks to support Internet traffic engineering and other applications14 18 The motivation for VoIPoMPLS is to take advantage of these new network capabilities in parts of the network where they are available to improve VoIP service by
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