Download CENTREX or PBX: The Impact of Internet Protocol by John R. Abrahams, Mauro Lollo PDF

By John R. Abrahams, Mauro Lollo

When you have the accountability to layout, improve and deal with information networks to hold IP Telephony (voice, video and data); need assistance in comparing competing IP-Centrex and IP-PBX structures; or want assistance in specifying the parameters for a provider point contract for IP-Centrex, this exact reference offers you the information you want to get the activity performed correct. It helps you to extra safely estimate the time and assets had to enforce IP Telephony on your association. The booklet describes the IP-Centrex choice of getting the phone corporation take accountability for the provider supply and gives the type of info provider companies have to increase advertising and revenues campaigns for IP-Centrex providers.

This precise source is helping you current your company’s telecom features, and provides a greater knowing of the pluses and minuses of aggressive revenues displays. It contains precis descriptions of 14 IP telephony structures at the world’s industry, whereas essentially picking the benefits and drawbacks of IP-Centrex. There are designated monetary analyses of 3 lifelike case reviews, including descriptions of the way Centrex is utilized in a variety of businesses.

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Where video communications are used this minimum bit rate requirement rises to 200 Kbps. ” This is in contrast to legacy Centrex, which in most cases is delivered by each phone line using one of the copper wire pairs (which are utilized as “thin” pipes in this case, as a bandwidth of only 4 kHz or 64 Kbps is required). 44 Centrex or PBX: The Impact of IP Broadband used to be defined, over the past decade, as bit rates above 45 Mbps (DS-3) in North America, or 34 Mbps (E-3) in other countries. But common usage now seems to define broadband as referring to any bit rates higher than 128 Kbps.

WAN Requirements The predominant service for carrying VoIP traffic is the VPN. A VPN delivers multiple service classes and interoperates well with the customer’s own IP networks, at lower costs than a customer-managed network. 2. One of two complementary architectures is used for most VPNs, namely MPLS or IP security (IPsec). Although MPLS is not strictly essential to carry voice/video over a WAN, it is certainly preferable and is used on well over 50 large carrier networks. ) 42 Centrex or PBX: The Impact of IP derived from Cisco’s proprietary Tag Switching technique; it provides 15 priority classes (through a 4-bit header) for packets being transported over a network.

In many of these cases this service provider is a good candidate to become the customer’s communications application service provider (CASP), in preference to the ILEC. 6 Controlled migration to IP-Centrex. Telecommuter Internet Protocol Centrex 21 When considering whether or not to entrust its in-house voice and video communications to a CASP, an organization’s management must evaluate the following topics: ◆ The specific IP-Centrex design being deployed by the CASP; ◆ The match between the feature set available, from the competitive IP-Centrex service, and that needed by the users; ◆ The local access technology being offered to the WAN and its scalability to accommodate growth (or, occasionally, contraction) of bandwidth needs; ◆ The perceived financial stability of the service provider, in a time when the finances of some long-established, large telcos also have been seriously questioned.

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