By Jonathan Davidson
A systematic method of realizing the fundamentals of voice over IP
Voice over IP (VoIP) has develop into a tremendous consider community communications, promising decrease operational expenditures, larger flexibility, and quite a few stronger purposes. that will help you comprehend VoIP networks, Voice over IP Fundamentals offers a radical advent to the fundamentals of VoIP.
Voice over IP Fundamentals explains how a uncomplicated IP telephony infrastructure is equipped and works at the present time, significant strategies referring to voice and information networking, and transmission of voice over facts networks. You’ll find out how voice is signaled via legacy phone networks, how IP signaling protocols are used to interoperate with present telephony structures, and the way to make sure stable voice caliber utilizing caliber of provider (QoS).
Even although Voice over IP Fundamentals is written for a person looking to know how to take advantage of IP to move voice, its target market includes either voice and information networking execs. some time past, pros operating in voice and knowledge networking didn't have to appreciate each one other’s roles. despite the fact that, during this global of time-division multiplexing (TDM) and IP convergence, you will need to know how those applied sciences interact. Voice over IP Fundamentals explains the entire information in order that voice specialists can comprehend info networking and information specialists can comprehend voice networking.
The moment variation of this best-selling publication comprises new chapters at the value of billing and mediation in a VoIP community, safety, and the typical varieties of threats inherent whilst packet voice environments, public switched mobilephone networks (PSTN), and VoIP interoperate. It additionally explains firm and service-provider purposes and services.
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Extra info for Voice over IP Fundamentals
VPN Another option available to business users is a VPN. VPNs offer enterprise customers the benefits of a private network (CUG) without the administration or equipment hassles of a large tie-line network (a tie-line is simply a permanent circuit between two points). A VPN enables an enterprise customer to dial a specific number, which then directs the PSTN to treat the customer as a CUG. S. does not want to have key-systems or PBXs in each of its 3000 stores. That would be a large network to manage and administer.
Chapter 1 discusses how the PSTN uses Signaling System 7 (SS7), ISDN, and in-band signaling as its primary signaling links. These are well-documented standards that have been evolving for many years. Although these signaling protocols cannot solve all signaling problems today, anyone can develop software to interface with the PSTN network. Note This software and hardware must be homologated in each country to which it is connected to the network. Homologation is a process in which each country certifies any equipment that connects with its PSTN.
323 is an ITU-T recommendation that specifies how multimedia traffic is carried over packet networks. 931, for example) to accomplish its goals. 323 is a rather complex protocol that was not created for simple development of applications. Rather, it was created to enable multimedia applications to run over "unreliable" data networks. 323. Most of the initial work in this area focused on multimedia applications, with video and data-sharing a major part of the protocol. 2). SGCP and MGCP, on the other hand, can accomplish a call transfer with a simple command, known as a modify connection (MDCX), to the gateway or endpoint.