Delivering Voice over IP Networks, 2nd Edition by Daniel Minoli

By Daniel Minoli

Contains new assurance at the advances in signaling protocols, second-generation switching and the advance of non-switched choices, and the implementation classes realized. comprises in-depth insurance of community architectures used to help VoIP, functionality and voice caliber issues, compression and integration tools for IP tranmissions.

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As noted, multicast support is also of interest. CIOA provides multicast support via the Multicast Address Resolution Server (MARS). The MARS model is similar to a client/server design because it operates by requiring a multicast server to keep membership lists of multicast clients that have joined a multicast group. A client is assigned to a multicast server by a network administrator at configuration time. In the MARS model, a MARS system, along with its associated clients, is called a cluster.

IP expects the higher layers to handle such functions. IP may lose PDUs, deliver them out of order, or duplicate them; IP defers these problems to the higher layers (TCP, in particular). Effectively, IP delivers PDUs on a best-effort basis. There are no network connections, physical or virtual, maintained by IP. 3. It is 20 or more octets long. A partial discussion of the fields, their purposes, and their format follows. The VERS field describes the version of the IP protocol, for example, Version 4.

In addition, the move to switched Ethernet all but eliminates delays due to random access contention (however, queuing delays in campus routers remain to be addressed). Cisco Systems, which is the market leader for routers, is approaching router-level QoS by using the following techniques4: An Overview of IP, IPOATM, MPLS, and RTP 33 • Smart queuing Priority queuing Custom queuing Weighted fair queuing Weighted Random Early Detection (WRED) • Filtering and shaping Traffic shaping Frame relay traffic shaping These techniques have been introduced in routers since the mid-1990s and are proving to be an initial step in the direction of end-to-end QoS in both the Internet and in intranet.

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