By William A. Flanagan
ISBN-10: 1118019210
ISBN-13: 9781118019214
Translates technical jargon into useful enterprise communications solutions
This booklet takes readers from conventional voice, fax, video, and information prone added through separate systems to a unmarried, unified platform supplying all of those prone seamlessly through the web. With its transparent, jargon-free factors, the writer allows all readers to raised comprehend and determine the transforming into variety of voice over web protocol (VoIP) and unified communications (UC) services which are to be had for businesses.
VoIP and Unified Communications is predicated at the author's cautious evaluation and synthesis of greater than 7,000 pages of released criteria in addition to a large diversity of datasheets, web content, white papers, and webinars. It starts off with an creation to IP expertise after which covers such themes as:
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Packet transmission and switching
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VoIP signaling and speak to processing
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How VoIP and UC are defining the future
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Interconnections with international services
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Network administration for VoIP and UC
This ebook includes a whole bankruptcy devoted to rate analyses and payback calculations, allowing readers to competently be certain the fast- and long term monetary influence of migrating to varied VoIP and UC services and products. there is additionally a bankruptcy detailing significant IP platforms and software program. through the e-book, diagrams illustrate how a number of VoIP and UC elements and platforms paintings. moreover, the writer highlights capability difficulties and threats to UC providers, steerage readers clear of universal pitfalls.
Concise and to the purpose, this article permits readers—from newcomers to skilled engineers and technical managers—to know the way VoIP and UC fairly paintings in order that everybody can expectantly care for community engineers, facts middle experts, and most sensible administration
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Extra info for VoIP and Unified Communications: Internet Telephony and the Future Voice Network
Example text
1. Fields in the IPv4 header identify the following parameters: Ver: version of the IP protocol, predominantly 4 until 2011 when those addresses reached exhaustion; being replaced by ver. 6. IHL: IP header length, the number of octets occupied by the header; needed so the receiver will know to process option fields when they are present. TOS: type of service, also known as the Class field; used to indicate expected handling to control priority, latency, or loss for this packet. Total length: number of octets in the entire IP packet, including nested headers, optional fields such as MPLS tags, and error check fields.
38) that treat facsimile separately from voice. More on this appears later in this book. 6 how a circuit switch reserves a path for a connection when a call is set up and releases that bandwidth and switch capacity when the call clears. Each call requires a specific amount of each resource. It is relatively easy to calculate the fixed number of calls that can exist on each part of the network at one time. That is, a transmission link contains a fixed number if DS-0 channels. The number of simultaneous backplane paths in a voice switch may limit the number of calls it can set up to far fewer than half the ports on the switch.
That terminating switch checks if the called line is free or busy and reports back before either switch starts to set up a voice path. If the called party is free, the switches signal each other to reserve trunks and switch capacity for a call. If busy, the reply generates a busy signal and there is no load placed on voice-path trunks. SS7 improved on earlier signaling in several ways. Analog CO switches signaled each other with tones on voice paths. 6 IMPAIRMENTS CONTROLLED: ECHO, SINGING, DISTORTION, NOISE 25 started to build a connection as the caller dialed.