By Richard Swale
This booklet covers all facets of telephony over IP networks, referred to as Voice over IP (VoIP). VoIP hit the headlines in the course of the mid-1990's amid claims referring to its effect upon latest Switched Circuit telephony prone. while VoIP has essentially supplied a spotlight for far debate in the telecommunications undefined, there was a transparent gulf among hype and truth. This ebook examines VoIP as a know-how and its attention in the undefined, the motivations for VoIP networks, a evaluate of the prestige of the foremost elements of a VoIP community and their improvement, and either present and rising purposes. This makes for crucial interpreting for people with a technical or company curiosity during this speedily constructing zone of telecommunications.Also available:Telecommunications community Modelling, making plans and layout - ISBN 0863413234Location and Personalisation: providing on-line and Mobility providers - ISBN 08634133820852960298
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Additional info for Voice Over IP: Systems and Solutions (Btexact Communications Technologies Series, 3)
Further aspects of VoIP applications are considered in Chapter 13. In reality, providing reliable, real-time-streaming, media applications over IP networks remains a challenging engineering problem to solve at scale. 6 VoIP in Practice In 1996 BT’s Systems Engineering unit, the predecessor of BTexact Technologies, at Adastral Park, was tasked with examining both the facts and the opportunities afforded by VoIP  under a project known as the ‘Initial Feasibility Study’ (IFS). This initiative was typical of the exploratory work undertaken by large incumbent 22 VoIP in Practice service providers at that point in the VoIP development story.
It can also handle much more complex functionality including call screening, call treatment in the event of unavailability of the called terminal, etc. The downside of this model is the potential complexity of the server technology and the balance between call control residing in the end-point or residing in the server. 8 server routed signalling Signalling modes in VoIP networks. 6. This is because, for a simple gateway solution, such as would be used for the trunk level switch replacement in the PSTN discussed in Chapter 6, it is easy to omit multimedia client support from the implementation and move server-based call control into the media gateway controller.
The issue remains, however, as to how this flexibility is linked to QoS control mechanisms in other than purely best-effort services. The greatest area on which VoIP is likely to have an impact, though, is in the area of network applications. Without any doubt, the IP environment is better suited to applications development than a switched-circuit telephone network. The problem will be how to blend the reliability and security of the telephone network with the potential openness of IP 26 References networks.