Voice Over MPLS : Planning and Designing Networks by Daniel Minoli

By Daniel Minoli

MPLS is many stuff to many folks. in case you are relocating IP voice site visitors, it might suggest functionality earnings for you. Daniel Minoli's "Voice Over MPLS" provides the technical and company lowdown on leading edge new suggestions for packet-based voice. What does it take to construct versatile, high-performance networks with more desirable caliber of provider? perhaps now not up to you think that. trustworthy voice providers that buyers can find the money for. With VoMPLS, you could carry the standard linked to VoIP over ATM hyperlinks with no the associated fee in both bandwidth or gear. in accordance with label-switching criteria from the IETF and the paintings of a few prime businesses, "Voice over MPLS" allows you to packetize voice with out the extra overhead of IP encapsulation. It additionally suppresses classes of silence, releasing up bandwidth for different makes use of. From the most skilled names in telecom know-how, "Voice Over MPLS" exhibits you the way to - supply a number of, top of the range providers with no high priced leased traces; carry low-bandwidth voice over ATM, body Relay, or IP; upload mobile "lines" with no including apparatus; clear up scaling concerns for small- and medium-sized clients; receive constant name caliber with no crunching bandwidth; learn how to shield sales in the course of deployment; assessment the aptitude function of VoMPLS in big-picture convergence; and overview VoMPLS's impression on public networks. right here, you discover the engineering information you wish for Label Switched Paths (LSPs), layers, signaling, CoS (Classes of Service), QoS (Quality of Service), VoMPLS in VPNs (Virtual inner most Networks), implementation thoughts, deployment, and extra.

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However, a slightly more general treatment is included in the material that follows because some applications (including VoMPLS) could also utilize more traditional voice-encoding/digitization techniques. Readers who are interested in the theory and physics of voice engineering may refer to the book Delivering Voice over Frame Relay and ATM by D. Minoli and E. 1 At a macro level, you need to collect speech at the source, digitize it in a way that is perceptually acceptable, as measured by a technique known as mean opinion score (MOS),2—8 and deliver the speech samples at the remote end with low delay, low jitter, low packet loss, and low missequencing, while avoiding the creation of echo impairments for the speaker.

A national network with 300 to 500 nodes is not atypical. Figure 1-21 depicts a simplified view of VoMPLS support in an MPLSready network. Figure 1-22 depicts a boiled-down network for an IXC where MPLS needs to coexist and support connectivity, and information flows. Figure 1-23 depicts a local ILEC environment. ) Although some people believe that you should use IP (or, more specifically, packet) for everything and that IP can be made to support anything and everything, it has always been known that multiplexing in gen- 29 Motivations, Developments, and Opportunities in VoP Figure 1-21 Support of VoMPLS switches in MPLS network.

24 For instance, an LSP can be set up based on explicit route constraints, QoS constraints, and other constraints. Constraint-based routing (CR) is a mechanism used to meet traffic-engineering requirements. These requirements can be met by extending LDP for support of constraint-based-routed LSPs (CR-LSPs). Other uses for CR-LSPs include MPLS-based VPNs. Traffic engineering is concerned with the task of mapping traffic flows to the physical network topology. Specifically, it provides the capability to move traffic flows away from the shortest path calculated by a routing protocol, such as the Routing Information Protocol (RIP), OSFP, or the Interior Gateway Protocol (IGP), and onto a less congested path (see Figure 1-14).

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