Converged Multimedia Networks by Juliet Bates, Chris Gallon, Matthew Bocci, Stuart Walker,

By Juliet Bates, Chris Gallon, Matthew Bocci, Stuart Walker, Tom Taylor

This e-book focuses mostly on allowing applied sciences for community convergence.  A significant goal is to teach the place parallel services exist in mounted and cellular voice community architectures and to give an explanation for how those features could be mixed. The authors describe the parts of a destiny converged structure and look at the subsequent key elements: QoS standards, Proposed answer Architectures, Protocol and Interface recommendations, Underlying community concerns and safeguard issues.  The e-book additionally compares and describes tasks from a number of criteria our bodies operating to simplify to a fresh structure and a standard set of protocols. The effect on a Multi Protocol Label Switching (MPLS) community, the popular approach to shipping for the center community, should be thought of intimately.

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Introduction 11 Providing a full PSTN replacement service implies having a very robust solution for QoS. Chapter 8 describes how to protect the network against the kind of overload caused by emergencies or television phone-ins. The network must be able to connect calls to both analogue phones as well as SIP terminals, and a Session Border Gateway should be deployed to secure the network against potentially misbehaving PC based SIP clients. Chapter 3 discusses the role of the Session Border Gateway in securing a network as well as describing some other measures that the company could take to protect themselves against attack.

In the NGN, multimedia sessions are supported by multiple RTP streams, for example, one for video and one for the soundtrack. Chapter 4 describes how Multimedia Conferencing uses RTP to take the contributing sources that make up a media stream and mixes them together while ensuring that each stream maintains its own synchronisation source. Voice services require low delay and delay variation because they are interactive, but voice can usually withstand a limited number of voice samples being lost by the network, whereas Video services require a low packet loss, but they are typically not interactive and so packet delay and delay variation can be higher.

The handling of services in the NGN is described in detail in Chapter 6. 3 Call Processing in the Legacy PSTN In order to understand the mechanisms behind call control in both the legacy PSTN and the emerging NGN, it is useful to examine how a Call Agents might be implemented. 5 shows an abstract model of a PSTN switch identifying key components and their interactions. Central to the operation of the switch are the two Basic Call State Models, one for the originating call half and one for the terminating call half.

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