By Jonathan Davidson
Examine real-world voice-over-IP deployment options and techniques from the Cisco specialists Deploying Cisco Voice over IP strategies covers: Definitive instructions on real-world VoIP deployments, the basics of the most recent VoIP suggestions, and a glance into the way forward for VoIP prone diversified concepts for engineering and correctly sizing traffic-sensitive voice networks uncomplicated options acceptable to echo research, echo cancellation, and finding and taking away echoes a variety of QoS positive aspects acceptable to voice specified 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 projects of designing a long-distance VoIP community the 2 sessions of hosted voice networks: controlled Multiservice (MMS) networks and packet voice VPNs Fax prone shop and ahead in addition to real-time relay fax providers pattern configurations and step by step examples that can assist you the best way to construct a VoIP community Deploying Cisco Voice over IP recommendations presents networking pros the information, suggestion, and perception essential to layout and installation voice over IP (VoIP) networks that meet buyers' wishes for scalability, providers, and protection. starting with an advent to the real initial layout parts that have to be thought of prior to enforcing VoIP, Deploying Cisco Voice over IP recommendations additionally demonstrates the elemental projects considering designing an efficient carrier provider-based VoIP community. you will finish with layout and implementation instructions for the various extra renowned and generally asked VoIP companies, corresponding to pay as you go prone, fax prone, and digital inner most networks (VPNs). This ebook is a collaboration of Cisco platforms CCIE(r) engineers, technical advertising engineers, and platforms engineers. you will find layout adventure from those who have designed the various world's greatest VoIP networks.
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Extra info for Deploying Cisco Voice over IP Solutions
Of analog tail circuit with a hybrid The analog telephone terminal is a 2-wire device, with a single pair of conductors used to carry both the Tx and Rx signals. For analog trunk connections, known as 4wire transmission, two pairs of conductors carry separate Tx and Rx signals. Digital trunks (T1/E1) can be considered virtual 4-wire links because they also carry separate Tx and Rx signals. A hybrid is a transformer that is used to interface 4-wire links to 2-wire links. It is a non-ideal physical device, and a certain fraction of the 4-wire incoming (Rx) signal 35 will be reflected back into the 4-wire outgoing (Tx) signal.
Consider the path Bob's voice takes from Montreal to London. Bob speaks into his mouthpiece and the analog signal arrives at the Montreal PBX within 1 ms. At the PBX, his analog voice signal is converted to a digital PCM stream and arrives at the Montreal IP gateway after only 1 ms more of delay. So it takes 2 ms for Bob's voice to go from his mouth to the voice gateway. The gateway sends out packets every 20 ms, which means each packet contains 20 ms of voice payload. Therefore, the voice gateway must wait to collect 20 ms of Bob's voice before it can fill the first packet.
Sufficient Bandwidth Before you consider applying any of the QoS features discussed in this chapter, you must first provision sufficient network bandwidth to support real-time voice traffic. 711 VoIP call (64 kbps payload + 16 kbps header) will sound poor over a 64 kbps link because at least 16 kbps of the packets (or 20 percent) will be dropped. Keep in mind that this example also assumes that no other traffic is flowing over the link (although link management and routing protocol traffic usually will exist).
Deploying Cisco Voice over IP Solutions by Jonathan Davidson