Deploying Cisco Voice over IP Solutions by Jonathan Davidson

By Jonathan Davidson

Research real-world voice-over-IP deployment recommendations and techniques from the Cisco specialists Deploying Cisco Voice over IP recommendations covers: Definitive instructions on real-world VoIP deployments, the basics of the most recent VoIP recommendations, and a glance into the way forward for VoIP prone various strategies for engineering and correctly sizing traffic-sensitive voice networks simple strategies appropriate to echo research, echo cancellation, and finding and removing echoes a number of QoS positive factors acceptable to voice distinct info on name admission keep an eye on (CAC) Dial plan configuration tips about Cisco H.323 gateways and gatekeepers used to help huge dial plans simple projects 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 will help you easy methods to construct a VoIP community Deploying Cisco Voice over IP ideas offers networking pros the information, suggestion, and perception essential to layout and installation voice over IP (VoIP) networks that meet clients' wishes for scalability, prone, and safeguard. starting with an advent to the $64000 initial layout parts that have to be thought of ahead of imposing VoIP, Deploying Cisco Voice over IP recommendations additionally demonstrates the fundamental initiatives fascinated with designing an efficient carrier provider-based VoIP community. you will finish with layout and implementation directions for a number of the extra renowned and greatly asked VoIP companies, similar to pay as you go prone, fax prone, and digital deepest networks (VPNs). This ebook is a collaboration of Cisco platforms CCIE(r) engineers, technical advertising engineers, and structures engineers. you can find layout adventure from those who have designed a number of the world's biggest VoIP networks.

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After you have verified that the echo canceller is working properly, you still need to determine the cause of the echo: Is the problem insufficient ERL in the tail, or is the echo delayed beyond the coverage of the echo canceller? Most persistent echoes are loud echoes. Delayed echoes are common, however, when the tail circuit involves a long-distance PSTN link, a series of alternating digital and analog links, or any other link with high latency. Identifying a Loud Echo You can use the voice gateway itself to measure the ERL of the tail circuit by using the gateway's echo canceller statistics reporting function.

The goal of service providers in eliminating echoes, therefore, is to identify clusters of echo complaints, look for common links, and fix the echos. There are a lot of dirty tails out in the PSTN, and it's unrealistic to think that every echo can be eliminated. The best you can do is make sure that your own network and tails are clean, which requires care in installation and provisioning, especially when connecting gateways to analog equipment. 46 Configuring Gateways to Minimize Echo As you've seen, echoes live in the analog tail circuit, not in the gateway.

ERL is > 15 dB Case Study Summary The customer was satisfied with our testing results and decided to use our suggested workaround of using FXS ports, which appeared as CO trunks to the Belgium PBX, out of the Belgium Cisco 3640 router. This solution reduced some of the network's 54 inward dialing flexibility, but because all inbound calls were handled by an autoattendant, no functionality was lost. This case study illustrates the importance of educating customers about the proper expectations of packet-based networks.

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