Voice Over IP Crash Course by Steven Shepard

By Steven Shepard

Recent advances in VoIP (Voice over IP) know-how have made it the answer of selection for voice carrier due to its cost-efficient and elevated reliability. Voice Over IP Crash Course deals useful know-how insurance, whereas discussing the enterprise, strategic and aggressive implications of VoIP deployment in agencies. The publication additionally covers the demanding situations confronted via carrier prone as they evolve to an IP infrastructure whereas carrying on with to function the PSTN. insurance includes:

  • IP and instant, IP protocols vs. PSTN
  • Interworking among SS7 and IP-based protocols
  • Network components
  • VoIP items and production strategies

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Sample text

Typically, they couldn’t describe what we were facing in more than the vaguest terms. ” Chapter 1 20 Figure 1-14 The four-layer process for considering a major infrastructure change Applications Software & Hardware Tools Infrastructure Modification Problem Identification Application Enhancement The school identified four critical applications that required enhancement: more effective use of voicemail, which we have already briefly discussed; campuswide message distribution; improved directory access; and enhanced information sharing.

First, a widely held belief exists that significant cost savings can be realized through the conversion from a traditional circuit-switched infrastructure to an IP-packet infrastructure. And although the outlay of real capital and expense dollars may not be as greatly reduced as many would like to think, the savings do come, and in a variety of ways. In a network that comprises multiple locations, packet switching reduces the cost of voice transmis- Setting the Stage 29 sion. Furthermore, when voice migrates to IP, it becomes one more data application and now has the ability ride the same network as the enterprise’s data traffic.

729 compression. 729 relies on a relatively complex signalencoding scheme called code-excited linear-prediction coding (CELP) to encode speech signals at 8 Kbps. The coder operates on speech frames of 10 ms that correspond to 80 samples at a sampling rate of 8,000 samples per second. The encoder includes voice activity detection and comfort noise generation (VAD/CNG), both important QoS additions for digital voice systems, and the coder/decoder (CODEC) is also capable of processing silence frames.

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