Download Deploying Cisco Voice over IP Solutions by Jonathan Davidson PDF
By Jonathan Davidson
Deploying Cisco Voice over IP strategies covers:* Definitive directions on real-world VoIP deployments, the basics of the newest VoIP ideas, and a glance into the way forward for VoIP companies* assorted innovations for engineering and correctly sizing traffic-sensitive voice networks* easy techniques appropriate to echo research, echo cancellation, and finding and doing away with echoes* quite a few QoS positive factors acceptable to voice* targeted details on name admission keep an eye on (CAC)* Dial plan configuration tips on Cisco H.323 gateways and gatekeepers used to aid huge dial plans* simple initiatives of designing a long-distance VoIP community* the 2 periods of hosted voice networks: controlled Multiservice (MMS) networks and packet voice VPNs* Fax prone shop and ahead in addition to real-time relay fax prone* pattern configurations and step by step examples that can assist you find out how to construct a VoIP networkDeploying Cisco Voice over IP options presents networking execs the data, recommendation, and perception essential to layout and set up Voice over IP (VoIP) networks that meet buyers' wishes for scalability, companies, and safeguard. starting with an creation to the real initial layout parts that must be thought of ahead of imposing VoIP, Deploying Cisco Voice over IP strategies additionally demonstrates the fundamental initiatives focused on designing a good provider provider-based VoIP community. It concludes with layout and implementation guidance for many of the extra well known and largely asked VoIP services,such as pay as you go providers, fax companies, and digital inner most Networks (VPNs).This publication is a collaboration of Cisco platforms. CCIE.s, technical advertising engineers, and structures engineers. during this booklet, you can find layout adventure from those who have designed a number of the world's greatest VoIP networks.
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S. over a satellite link with a round-trip delay of several hundred milliseconds, the echo is obvious and annoying. The only change has been the insertion of delay. VoIP technologies impose a fundamental transmission delay due to packetization and the buffering of received packets before playout at the receiving endpoint. This delay is generally much smaller than the delay associated with satellite links, but it is usually sufficient to make a previously unnoticeable echo objectionable. End-to-End Voice Call Delays Analog transmission is very fast, limited only by the propagation speed of electrons in a wire (which is much lower than the speed of light, but still very fast) or photons in a fiber-optic link.
Packet Classification To guarantee bandwidth for VoIP packets, a network device must be able to identify VoIP packets in all the IP traffic flowing through it. Network devices use the source and destination IP address in the IP header or the source and destination UDP port numbers in the UDP header to identify VoIP packets. This identification and grouping process is called classification and it is the basis for providing any QoS. Besides the static classification methods involving Layer 3 or Layer 4 header information matching, you can use a mechanism such as Resource Reservation Protocol (RSVP) for dynamic classification.
38 Figure 2-8. Echo canceller in London eliminates Bob's echoes in London tail circuit. Echo cancellers have the following properties: • • Echo cancellers face into the PSTN tail circuit. An echo canceller eliminates echoes in the tail circuit on its side of the network. Note that delay and jitter in the WAN do not affect the operation of the echo canceller because the tail circuit is static, and that's where the echo canceller operates. From the perspective of the echo canceller in the London voice gateway, the Rx signal is Bob's voice coming across the packet network from Montreal.