Recursos VoIP - Enlaces

Fuente: Columbia University Department of Computer Science
Formato: PDF

We describe the architecture and implementation of our Internet telephony test-bed intended to replace the departmental PBX (telephone switch). It interworks with the traditional telephone networks via a PSTN/IP gateway. It also serves as a corporate or campus infrastructure for existing and future services like web, email, video and streaming media. Initially intended for a few users, it will eventually replace the plain old telephones from our offices, due to the cost benefit and new services it offers. We also discuss common interoperability problems between the PBX and the gateway.

Fuente: Cisco Systems
Formato: PDF

Traffic Analysis for Voice over IP discusses various traffic analysis concepts and features that are applicable to Voice over IP (VoIP). This document presents fundamental traffic theory, several statistical traffic models, application of traffic analysis to VoIP networks, and an end-to-end traffic analysis example.

Fuente: Nortel Networks
Formato: PDF

The move has begun to convert the world's circuit-switched voice infrastructure to Voice over IP (VoIP). Voice over IP can address problems in the network, such as lack of central office facilities, while freeing up capital that may have been planned to address existing problems. Deploying VoIP access in the typical end office requires as much as 80 percent less space and can reduce power and HVAC requirements by up to 50 percent1. In many cases, carriers have planned real estate or equipment upgrades to address space and/or power shortages. By redirecting this planned spending towards a transition to VoIP, facility costs and space requirements can be reduced.

Fuente: Intel
Formato: PDF

Yesterday’s Voice over IP (VoIP) hype has become today’s market reality. VoIP technology has matured and interoperability issues are being resolved; broadband connectivity is growing and increasingly affordable; and today’s high bandwidth wireless LAN solutions can dramatically extend access to VoIP services. These factors have created an environment that is primed for VoIP rollout and adoption. Everyone—from carriers to end-users—is motivated to make the transition, and for the same reasons: VoIP enables richer, more personalized and better integrated services at reduced cost.

Fuente: 3Com
Formato: PDF

The road to convergence will be at least partially different for each organization. Every organization begins with unique assets, legacy operations and its own goals. All of the approaches to construct a converged environment must recognize the fact it will be composed of a set of hardware, software and transmission building blocks. No single vendor will be able to provide all the components and services.

Fuente: 3Com
Formato: PDF

Convergence can best be defined as one structure, one architecture to support all forms of information media on all forms of network technology. The massive adoption of the TCP/IP protocol suite has brought together multiple network technologies, local and wide area networks (LANs and WANs), wired and wireless, public and private networks, and access to a near-infinite number of applications. Even though the earlier attempts at convergence did not foresee the dominance of TCP/IP, convergence is now generally acknowledged to be based on the IP protocol. IP is the glue that binds the networks and applications together.

Fuente: Cisco Systems
Formato: PDF

Troubleshooting a Cisco IP telephony network can be a daunting task. This sample chapter from Troubleshooting Cisco IP Telephony, argues that even before exploring the myriad of tools, traces, and techniques available to you that aid in troubleshooting, you must assume the role of detective. This involves developing a systematic method by which you can focus on the problem and narrow it down until you determine the root cause. The chapter outlines a troubleshooting methodology that consists of learning how to find clues and track down your "suspect" by breaking the problem into smaller pieces and tackling each piece individually. Coverage includes where to look for clues and track down the problem while avoiding as many dead ends as possible.

Fuente: Agilent Technologies
Formato: PDF

New communications technologies are developed because they offer some advantage over existing ones. One recent example is Voice Over IP (VoIP) as defined by the International Telecommunication Union H.323 recommendation. But along with the benefits of new communications protocols come new challenges. H.323 is relatively new, network engineers and administrators struggle with multi-vendor compatibility, standards compliance and interpretation, and a whole host of other issues related to deploying and maintaining VoIP networks. This Product provides a brief overview of the ITU-T H.323 recommendation as it relates to Voice Over IP networks. We will discuss some of the most common problems encountered by those deploying and maintaining VoIP networks - many of which are related to signaling. We will then show how to troubleshoot H.323 signaling problems using the Ethernet or Fast Ethernet Agilent Advisor LAN and its H.323 protocol decodes.

Fuente: Newport Networks
Formato: PDF

The UK will probably have the first regulated Inter-Service Provider VoIP interconnect anywhere in the world. The standards for this interconnect are being created under the auspices of the UK Network Interoperability Consultative Committee (NICC) and is the result of the combined efforts of interested parties in the main Service Providers, both mobile and fixed, and vendors that operate within the UK.The boundary conditions that have been set for the service offered at the interconnect are intended to mirror those available for PSTN service within the UK. This is quite natural since the service being provided by the IP system is a PSTN replacement service.

Fuente: Cisco Systems
Formato: PDF


This paper provides an understanding of packet voice protocols, and clarifies some confusion and myths that surround all of the protocols.

Fuente: Ubiquity Software
Formato: PDF

The growing thirst among communications providers, their partners and subscribers for a new generation of IP-based services is now being quenched by SIP - the Session Initiation Protocol. An idea born in a computer science laboratory less than a decade ago, SIP is the first protocol to enable multi-user sessions regardless of media content and is now a specification of the Internet Engineering Task Force (IETF).

Fuente: Cisco Systems
Formato: PDF

Understand the specific functions Voice over Internet Protocol (VoIP) signaling protocols perform and how this information will help you design, build, maintain, and troubleshoot a Cisco VoIP implementation.

Fuente: Avaya
Formato: PDF

This white paper shows how converging your traditional voice and data networks can save money and increase efficiency and productivity throughout your organization - just what it takes to remain competitive in today's marketplace.

Fuente: IBM
Formato: PDF

Unified communications and collaboration can help organizations deliver a user experience that brings together communications and collaboration silos. By providing users with a single, integrated experience, companies can cultivate more dynamic and flexible business systems.

This paper from IBM highlights key drivers, challenges and characteristics of a unified communications and collaboration strategy.

Fuente: Intel
Formato: PDF

Several factors suggest that the time for a widespread adoption of advanced messaging solutions has come. Enterprises have a growing mobile and distributed workforce that needs improved methods of communication. Messaging technology has advanced with the introduction of unified communications, the proliferation of new messaging devices, significant strides in voice and data convergence, and the widespread adoption of a host of open standards for messaging-related technologies. This paper will discuss the evolution of unified messaging into unified communications, the market segment and benefits of today's messaging solutions, strategies for building messaging systems today, and the role of modular network components in messaging solutions.