Recursos VoIP - Enlaces

Fuente: Avaya
Formato: PDF

This white paper is intended for IT Managers, Network Architects and System Administrators who need a better under-standing of how the Avaya ExpertNet VoIP Assessment Tool (EVAT) software operates on any network and gathers information in order to determine the readiness of any network for IP telephony and video. Avaya Engineers deploy the EVAT suite of software onto the customer network and run the assessment typically for one to two weeks. The engineers then collect the data and generate detailed analysis reports that help them determine the readiness of the network for voice and video traffic. The paper will focus on the some factors that can affect successful Voice over IP (VoIP) deployment.

Fuente: Avaya
Formato: PDF

This document contains minimum basic network requirements to ensure good voice quality when using Avaya IP products and solutions. No document can satisfy the detailed needs of every network, and therefore this paper serves only as a starting point. The first section provides a short list of networking factors, with explanations of those factors on the following pages. Use this section as a checklist to determine if your network meets the minimum requirements for implementing Voice over Internet Protocol (VoIP) with acceptable quality. The second section contains networking basics for those who haven’t been exposed to networking. It also explains why VoIP applications often yield poor results on data networks that typically run well.

Fuente: Avaya
Formato: PDF

Voice over IP (VoIP) over the Internet or private WAN often falls short of delivering business quality voice services. Avaya Converged Network Analyzer (CNA) monitors VoIP call quality, assesses all available paths for delivering VoIP traffic, and automatically adjusts the network infrastructure to preserve the quality of voice calls in progress. Converged networking with Avaya CNA can make the difference between success and failure for VoIP deployments that include WAN connections. The combination of the software's extensive measurement techniques, sophisticated modeling of VoIP behavior, and real-time correction capability can reduce the impact of brownouts and other network events on VoIP calls.

Fuente: Dell
Formato: PDF

Voice traffic is highly sensitive to latency and packet loss, and this presents special challenges in network design and administration. This paper explains how to use Dell PowerConnect switches in networks that carry voice over IP (VoIP) traffic. The paper describes quality of service (QOS) mechanisms and provides sample configurations for implementing QOS policies to prioritize latency-sensitive voice traffic.

Fuente: Cisco Systems
Formato: PDF

The Cisco Gatekeeper maintains a record of all active calls so that it can manage the bandwidth resources in its zone. In a cluster configuration, the Gatekeeper Update Protocol (GUP) announcement indication message is exchanged every set interval of time and carries information about the bandwidth utilization for the zone. This GUP message exchange allows the alternate Gatekeepers to properly manage the bandwidth for a single zone, even though the Gatekeepers are in separate physical devices.

Fuente: Cisco Systems
Formato: PDF

NetFlow is a Cisco IOS technology that provides statistics on packets flowing through the router. NetFlow is the standard for acquiring IP operational data from IP networks. NetFlow provides network and security monitoring, network planning, traffic analysis, and IP accounting. Flexible NetFlow improves on original NetFlow by adding the capability to customize the traffic analysis parameters for specific requirements. Flexible NetFlow makes it easier to create more complex configurations for traffic analysis and data export through the use of reusable configuration components. This paper provides an overview of Flexible NetFlow and the advanced Flexible NetFlow features and services.

Fuente: Cisco Systems
Formato: PDF

Network services have changed dramatically in recent years, most notably due to the addition of voice, video, and mission-critical data to existing data traffic. Customers demand guaranteed reliable network services for business critical applications. Cisco IOS IP Service Level Agreements (SLAs) is a network performance measurement and diagnostics tool that uses active monitoring, which generates traffic in a reliable and predictable manner to measure network performance. Cisco IOS IP SLAs actively send data across the network to measure performance between multiple network locations or across multiple network paths. It simulates Voice over IP (VoIP) codecs and collects real time network performance information, including response time, one-way latency, jitter, packet loss, and voice quality scoring.

Fuente: Siemens
Formato: PDF

Crisis Management and Business Continuity professionals understand that effective communication before; during and after an incident can drastically alter the outcome of that incident. This paper explains what commercially available communication systems really work in a crisis, drawing on real world examples of communication in both large and small scale incidents. Specific information on how systems coped during the New York 9/11 attacks and recent London bombings is also included.

Fuente: Avaya
Formato: PDF

Avaya Converged Network Analyzer (CNA) provides converged management for network infrastructure. The software can monitor, assess, and adjust the network delivery infrastructure in real time to maximize applications availability, while optimizing between cost and performance. The result is a network infrastructure that is self-healing and self-optimizing. This white paper describes one customer's use of Avaya CNA specifically to improve VoIP quality over their Internet VPN links between major offices.

Fuente: Avaya
Formato: PDF

The Avaya and Extreme Alliance was formed to deliver secure and best of breed, converged network solutions for enterprises to optimize voice, data and video applications on an easily managed robust infrastructure. The relationship consists of providing jointly developed product and technology solutions as well as Avaya single point of accountability for complete end-to-end networks. One of the goals of the Extreme Networks, Inc. and Avaya, Inc. joint development projects is to provide simplicity for deployment and management of a converged network, security to protect infrastructure and data, as well as tools to allow optimum use of resources.

Fuente: Intel
Formato: PDF

Successful Voice over IP (VoIP) deployments can deliver solutions that provide voice quality that is comparable to traditional circuit-switched telephone networks, but at a lower cost. Building on the background information provided in Overcoming Barriers to High-Quality Voice over IP Deployments, this paper discuss in detail impairments such as delay, jitter, packet loss, and echo in Ethernet-based VoIP implementations. It provides guidance for choosing CODECs, provisioning networks to support VoIP, and working with interconnect devices such as hubs, bridges, switches, and routers.

Fuente: Telchemy
Formato: PDF

Today’s voice quality monitoring tools can give misleading results. This means that service providers are not getting a true picture of the quality of service their subscribers are experiencing.

Service providers, whether phone companies or the network managers of major corporations, need to be able to accurately measure service quality in real time for most or all calls made through their networks. This has been made possible with the introduction of VQmon, an emerging standard for voice quality monitoring.

Fuente: University of California
Formato: PDF

This paper focuses on the application of Voice over IP (VoIP) and illustrates how measurement-based admission control and SLAs together can be designed to provide end-to-end QoS in a dynamic, fully decentralized way. A game-theoretic model for the scheme is formulated for studying its properties. It presents some preliminary results and propose future research directions for improving the efficiency of the current solution.

Fuente: Cisco Systems
Formato: PDF

This white paper examines the basic aspects of echo analysis and describes the effects of various network elements on echo. This document also explains how echo is measured and how echo cancelers work to estimate and eliminate echo. It looks at customer and service provider expectations about echo, and explains how to configure gateways to minimize echo.

Fuente: Multi-Tech Systems
Formato: PDF

In this paper we deal with mapping performance-oriented IP services such as Integrated Services (IntServ) or Differentiated Services (DiffServ) onto network performance parameters for cell-switched transport networks, as for example ATM. The impact of translating IP performance parameters into ATM network services is analyzed and the detrimental effects of careless mappings are illustrated. Then, approaches to circumvent these detrimental effects are presented. In general, it is agreed that heterogeneity is a fact for today’s large-scale internetworks, with the global Internet as the most prominent example. Therefore it is also a fact for QoS architectures. Anyway, competition, different strengths and evolution are arguments for heterogeneity with regard to QoS as well.