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voip - ip telephony
(1238 results)-
Tools & Templates
Cisco TelePresence Calculator: Save Money and Reduce Your Carbon Imprint
Sep 2010
Learn how TelePresence can help pay for itself, while lowering greenhouse gas. Use this calculator to answer these two questions: How much greenhouse gas can Cisco TelePresence help me avoid?How...
Provided by TANDBERG, now part of Cisco
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Whitepapers - Video
Video: Intercompany Cisco TelePresence: Connecting Everyone, Everywhere, Across Company Boundaries
Sep 2010
This video explains Cisco TelePresence and its intercompany capability, and how it offers a highly secure, reliable experience, even over disparate networks. One-button simplicity, add attendees,...
Provided by TANDBERG, now part of Cisco
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White Papers
NS-2 Extension for Dynamic Optimization Within Multiple VoIP Sessions Over Wireless Networks
Nov 2009
The Network Simulator NS-2 is a versatile extendable tool that is widely used in the networking community. It provides support for simulation of many protocols over networks including 802.11e. To...
Provided by National University Of Ireland
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White Papers
A Survey of VoIP Implementations in Taiwan 500 Biggest Export-Import Enterprises
Nov 2007
Voice over Internet Protocol (VoIP) is a critical innovation technology in the globally oriented business world, which emphasizes flexibility and efficiency as means to reduce operation cost and...
Provided by National Cheng Kung University
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White Papers
The Design of a Multi-Party VoIP Conferencing System Over the Internet
Jan 2008
This paper presents the design of a VoIP conferencing system that enables the voice communication of multiple users in the Internet. After studying the conversational dynamics in multi-party...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Mathematical Model of the Skype VoIP Congestion Control Algorithm
Dec 2008
The Internet is changing from being only an efficient platform for data delivery to become also a platform for audio/video applications. The stability of the traditional Internet is due to the TCP...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Economic Mechanisms for Protecting VoIP Services Within the IMS
Jul 2008
The IP Multimedia Subsystem (IMS) is the proposed Next Generation Network (NGN) architecture that will be used to provide revolutionary services based on an IP backbone. For successful IMS...
Provided by University of Cape Town
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White Papers
An Efficient Scheduling Scheme to Enhance the Capacity of VoIP Services in Evolved UTRA Uplink
Mar 2008
An efficient scheduling scheme is proposed to increase the available capacity of VoIP services over evolved UTRA uplink. On top of the advantages of persistent scheduling, the proposed scheme...
Provided by Yonsei University
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White Papers
Task Dependency of User Perceived Utility in Autonomic VoIP Systems
Dec 2007
The transmission of voice-over-Internet protocol (VoIP) network traffic is used in an increasing variety of applications and settings. Many of these applications involve communications where VoIP...
Provided by Drexel University
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White Papers
Five Steps to Ensuring a Successful VoIP Migration
Mar 2009
Voice over IP (VoIP) has arrived and is here to stay. Many contact centers are realizing the increased flexibility and cost advantages of placing voice traffic on existing data networks. This...
Provided by inContact
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White Papers
The Implementation of Speaker Recognition on VoIP Auditing in Gigabit High-Speed Environment
Nov 2009
VoIP(Voice over Internet Protocol) is low-cost, flexible and brings great convenience to people's life, but it also brings security problems such as cyber-crime issues. This paper aims to solve...
Provided by Academy Publisher
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White Papers
Joint Pre-Echo Control and Frame Erasure Concealment for VoIP Audio Codecs
Aug 2009
Pre-echo artifacts are a common problem of transform audio codecs owing to their comparatively large block lengths. If such codecs are used in Voice-over-IP (VoIP) applications, the concealment of...
Provided by EURASIP
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White Papers
Protecting VoIP Services Against DoS Using Overload Control
Jul 2008
Like any other Internet-based service VoIP servers can be the target of denial of service attacks. While operators will certainly deploy various mechanisms to prevent such attacks, detecting and...
Provided by Tekelec
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White Papers
Supporting VoIP Services in IEEE 802.11e WLANs
Sep 2009
Voice over Internet Protocol (VoIP) over Wireless Local Area Network (WLAN) is becoming popular thanks to its cost efficiency. How-ever, it has been a challenge to provide good quality of VoIP...
Provided by Iowa State University
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Whitepapers
Privacy in VoIP Networks: A K-Anonymity Approach
Jan 2009
Peer-to-Peer VoIP (voice over IP) networks, exemplified by Skype, are becoming increasingly popular due to their significant cost advantage and richer call forwarding features than traditional...
Provided by IBM
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White Papers
Voice-TFCC: A TCP-Friendly Congestion Control Scheme for VoIP Flows
Jun 2008
Typically, VoIP traffic is deployed as best-effort traffic over Internet links. This voice traffic lacks effective and scalable end-to-end congestion control. The paper proposes a new VoIP...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Statistical Analysis and Modeling of Internet VoIP Traffic for Network Engineering
Jan 2010
Network engineering for Quality-of-Service (QoS) of Internet voice communication (VoIP) can benefit substantially from simulation study of the VoIP packet traffic on a network of routers. This...
Provided by Purdue University
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White Papers
Rural Telemedicine Networks Using Store-and-Forward Voice-Over-IP
Aug 2009
Store and forward Voice-over-IP is a suggested solution for supporting Telemedicine at rural health clinics in developing countries. Solutions described to date are designed to support...
Provided by European Federation for Medical Informatics
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White Papers
VoIP LAN/MAN Traffic Analysis for NGN QoS Management
Oct 2009
Strict requirement is emphasized regarding QoS guarantees of the NGN (Next Generation Network) networks today. DiffServ mechanism is applied mostly for classification of protocol data units of...
Provided by University of Debrecen
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White Papers
Telemedicine Using VoIP Combined With a Store and Forward Approach
Jan 2010
Rural areas in South Africa have unique conditions such as remoteness and scarcity of reliable public facilities. Information and Communication Technologies (ICTs) introduced into these areas must...
Provided by University of Cape Town
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White Papers
Analysis of the Perceived VoIP Quality Under Various Wireless Network Conditions
Feb 2010
This paper focuses on the comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover, under different background traffic conditions...
Provided by Technical University of Crete
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White Papers
Eliminating Handoff Latencies in 802.11 WLANs Using Multiple Radios: Applications, Experience, and Evaluation
Jan 2010
Deployment of Voice-over IP (VoIP) and other real-time streaming applications has been somewhat limited in wireless LANs today, partially because of the high handoff latencies experienced by...
Provided by University of Wisconsin-Madison
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Case Studies
Lewis Brisbois Bisgaard & Smith Proves the Case for Polycom and Broadsmart IP UC Solutions
Feb 2010
For Lewis Brisbois Bisgaard & Smith LLP (LBBS), time is money. That's true for any law firm, but with more than 750 attorneys and over 20 offices, LBBS isn't just any law firm. The company...
Provided by Polycom
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Case Studies
Zultys - VoIP Call Centre Deployment
Jan 2010
Isuzu-General Motors Australia truck division (Isuzu Trucks) import, distribute, and support a wide range of state of the art commercial vehicles, ranging from 4 tones through to 68 tones. Isuzu...
Provided by Globalnet Solutions Australia
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Case Studies
Voice Over IP Is a Sound Investment for Leading Banking Firm
Mar 2009
Founded in 1929, Sterling National Bank, a subsidiary of Sterling Bancorp (NYSE: STL), offers a full range of banking and financial services products, combined with a unique high-touch approach to...
Provided by Polycom
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Case Studies
Tæppeland Improves Customer Service and Sales Performance With Polycom Wireless Telephony Solution
Sep 2009
Tæppeland, Denmark's leading domestic and commercial flooring retailers. Tæppeland have very large premises throughout the country, where the staff was often under pressure to answer a ringing...
Provided by Polycom
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Case Studies
Polycom NGT UC Solutions for Small Business Help ASG Save Money and Enhance Efficiency
Feb 2010
Advanced Systems Group (ASG) is a national open systems integrator found that there was a need for effective communication between headquarters and remote offices. ASG decided it was time to make...
Provided by Polycom
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Case Studies
Polycom IP Telephony Solutions Deliver Concrete Benefits to Arabian Cement Company
Jul 2009
Arabian Cement Company wanted an integrated communication network system for effective communications with isolated and geographically dispersed sites is an important issue. With a growing network...
Provided by Polycom
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Case Studies
Polycom Mobile Telephony Solution Enhances Communication and Improves Efficiency at Campus IFOM-IEO
Mar 2009
Challenge in front of Milan-based Campus IFOM-IEO was to provide key users at the institute with a roaming telephony service that would enable reliable communication at all times wherever they are...
Provided by Polycom
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Case Studies
Polycom Solution Delivers Lesson in Roaming Communication for Lausanne Nursery Schools
Aug 2008
The challenge in front of Lausanne nursery schools was To provide a flexible, robust, roaming communication solution for staff at six nurseries operated by the City of Lausanne that has good...
Provided by Polycom
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Case Studies
Polycom Global Services Helps Colorado Department of Transportation Ensure Successful Video Conferencing Implementation
May 2010
For the Colorado Department of Transportation (CDOT), responsible for a 9,134-mile highway system handling more than 48 billion vehicle miles of travel annually, the budget impact of travel can be...
Provided by Polycom
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Case Studies
Edgewater Systems Leverages JEP-Hosted Polycom VoIP Solution for Cost Savings, Business Continuity, and Productivity Gains
Feb 2010
Reliable phone service is key to the organization for communicating with current and potential clients, whether scheduling routine appointments or use in an emergency situation. The existing...
Provided by Polycom
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Case Studies
Polycom VoIP Solutions, TMC, and Adaption Technologies Drive Down Retail Costs for Incredible Pizza
Sep 2009
With stores ranging in size from 22,000 to 90,000 square feet, opening a new Incredible Pizza Company location represents a significant investment. To reduce its costs - and to help offset the...
Provided by Polycom
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Whitepapers
An Aggregative Approach for Scalable Detection of DoS Attacks
Oct 2008
In Voice Over IP (VoIP) systems, intruders can launch DoS attacks by establishing a large number of open connections to prevent the system from serving legitimate users. Existing defenses against...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Novel Protocol Design and Collaborative Forensics Mechanism for VoIP Services
Feb 2012
The simplicity and low cost of Voice over Internet Protocol (VoIP) services has made these services increasingly popular as the Internet has grown. Unfortunately, these advantages of VoIP are...
Provided by Academy Publisher
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Webcasts
How to use TCO to build a business case for Unified Communications
Oct 2010
Discover how to provide quantifiable bottom-line proof to support a unified communications purchase.
Provided by ShoreTel
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White Papers
A Strategic View of Application Converged Networks
Oct 2010
Access real-world lessons learned to help you successfully deploy a converged network. See how your technology choices can reduce complexity and costs while helping guarantee your convergence...
Provided by Alcatel-Lucent
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Whitepapers - Video
See the possibilities of a future with an Application Fluent Network
Oct 2010
See how an Alcatel-Lucent Application Fluent Network can help you build a high performing, low complexity converged network. No matter what industry you're in, get the performance you need to meet...
Provided by Alcatel-Lucent
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Product Specs
Avaya Aura Collaboration Server
Sep 2010
Today's businesses must be one step ahead of the competition. Productivity-enhancing communications solutions are a key element of an overall strategy. However, trialing new applications can be...
Provided by Avaya
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Product Specs
IP Office Mobile Worker: One Number Access for Employees on the Road
Jan 2010
For staff who are often out of the office, but don't require a laptop, IP Office Mobile Worker (available with IP Office Preferred Edition and Advanced Edition) keeps them readily accessible....
Provided by Avaya
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White Papers
Developing Robust VoIP Router Honeypots Using Device Fingerprints
Dec 2010
As the telegram was replaced by telephony, so to Voice over IP (VoIP) systems are replacing conventional switched wire telephone devices, these systems rely on the Internet connectivity for the...
Provided by Edith Cowan University
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White Papers
Security Analysis of Session Initiation Protocol - A Methodology Based on Coloured Petri Nets
Dec 2010
In recent years Voice over Internet Protocol (VoIP) has become a popular multimedia application over the Internet. At the same time critical security issues in VoIP have started to emerge. The...
Provided by University of South Australia
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White Papers
Guide to Starting Your Own Calling Card Business Share
Feb 2012
A Calling Card business is a popular kind of activity in the VoIP sphere. The Calling Card platform allows one to provide subscribers with international or long distance calls via a VoIP network....
Provided by Speedflow Communications
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Podcasts
Scalable VoIP Mobility Integration and Deployment
Jan 2012
In this podcast, the speaker explains how to design their Wireless LANs for a VoIP deployment, as well as teaching people to use AirMagnet's VoFi Analyzer. The speaker discusses about Network...
Provided by Wireless LAN Professionals
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Case Studies
Croatian Automobile Dealership Improves Service and Sales
Nov 2009
AutoZubak challenge is to help callers reach the right person, the first time and meet the needs of a mobile workforce. AutoZubak decided to replace its standalone PBX systems with a centralized...
Provided by Cisco Systems
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Case Studies
All-IP Service Provider Achieves 99% Provisioning Flowthrough
Jun 2008
Cbeyond is a company on the fast track one of the Voice over Internet Protocol (VoIP) service providers. The systems and spreadsheets that Cbeyond had been relying on to reserve and assign network...
Provided by Telcordia Technologies
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White Papers
A Study on Countering VoIP Spam Using RBL
Jan 2012
A threat of VoIP spam is becoming more and more actualized with the growth of VoIP service. Currently, most spammers send spam through internet telephony because they are possible to send spam in...
Provided by International Association of Computer Science & Information Technology (IACSIT)
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White Papers
Multiple Access Techniques in 4G
Jul 2011
Yet there are several challenges that inhibit the progress of 4G and researchers throughout the world are contributing their ideas to solve these challenges. Fourth Generation is the next...
Provided by Planetary Scientific Research Center
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White Papers
Security in VoIP Network Using Neural Network and Encryption Techniques
Jan 2012
Voice over Internet Protocol is one of the fastest growing applications. Since VoIP networks are very much vulnerable to attacks, providing security in such networks is a matter of great concern....
Provided by International Association of Computer Science & Information Technology (IACSIT)
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White Papers
Adaptive Localized Active Route Maintenance Mechanism to Improve Performance of VoIP over Ad Hoc Networks
Feb 2011
An important characteristic of a mobile ad hoc network routing protocol is connectivity maintenance. The protocol's ability to maintain routes and react to topology changes due to link failures...
Provided by Academy Publisher
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White Papers
Exploring Attributes for Selecting VoIP Service in Korea
Jan 2012
In Korea, the number of VoIP users is expected to rapidly increase after introducing VoIP number portability on October 31, 2008. The total number already gone beyond 2 million, and the number of...
Provided by International Association of Computer Science & Information Technology (IACSIT)
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White Papers
Multiplexing SIP Applications Voice Packets Between SWVG Gateways
Jan 2012
SIP applications are expected to dominate the VoIP area in the near future. Unfortunately, the small packet size sending by SIP applications causes packet overhead and network overload. That is,...
Provided by International Association of Computer Science & Information Technology (IACSIT)
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White Papers
Modified Secret Sharing Over a Single Path in VoIP With Reliable Data Delivery
Jan 2012
Voice over Internet Protocol (VoIP) is a new fancy and up growing technology. A major change in telecommunication industry is VoIP. The transmission of Real time voice data is not as easy as...
Provided by International Journal of Computer Science Issues
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White Papers
Traffic Trading in the Competitive International Voice Market
Aug 2009
This paper highlights the trends that are reshaping the international long distance voice market. The authors' analysis focuses on voice exchanges, namely, electronic marketplaces where huge...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Cross-platform Approach to Advanced IP-Telephony Services Using JAIN-SIP
Jul 2010
SIP is a call control and signaling protocol that was adopted by the 3GPP to deliver IP multimedia services to the mobile network. Cross platform IP-telephony service creation is a challenging...
Provided by Academy Publisher
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White Papers
HOSPITAL: Host and Network System Profiler and Internet Traffic Analyzer
Nov 2010
The ever-increasing complexity and diversity of the Internet pose several challenges to network operators and administrators and, in general, Internet users. More specifically, because of the...
Provided by University of Minnesota
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White Papers
Design and Performance Evaluation of Service Overlay Networks Topologies
Apr 2011
Nowadays, Internet still lacks of an adequate support for QoS-sensitive applications, such as VoIP, Videoconference, and Video-on-Demand. To a large extent, this is due to the fact that Internet...
Provided by Academy Publisher
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White Papers
Experimental Assessment of BitTorrent Completion Time in Heterogeneous TCP/uTP Swarms
Oct 2011
BitTorrent, one of the most widespread file sharing P2P applications, recently got rid of TCP by introducing an application-level congestion control protocol named uTP. The aim of this new...
Provided by Telecom ParisTech
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White Papers
Transmission of Delay Sensitive Data Over Non- QoS Enabled WANs
Jul 2011
Vendors of Voice Over IP (VOIP) and other delay sensitive systems have always marketed their products with the stipulation that performance could be drastically affected unless end-to-end Quality...
Provided by Cyber Journals
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White Papers
Optimizing Service Availability in VoIP Signaling Networks, by Decoupling Query Handling in an Asynchronous RPC Manner
Jul 2008
This paper presents some aspects of the communications in distributed systems, with a special accent on the needs of VoIP systems. It describes some interactions between servers, using different...
Provided by Technical University of Cluj-Napoca
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White Papers
Evaluation of Security and Countermeasures for a SIP-Based VoIP Architecture
Jul 2008
Evaluation tests were conducted on Asterisk IPPBX and several SIP hardware and software clients from the security point of view. The tools involved allow scanning, enumerating, fingerprinting, UDP...
Provided by Technical University of Cluj-Napoca
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White Papers
Network Analyzer Development: Independent Data, OPNET Simulation Tool and Real Network Comparison
Mar 2010
This paper presents a complete network analyzer development for heterogeneous services in campus environment. The purpose of this paper is to define the accuracy of network analyzer development...
Provided by International Association of Computer Science & Information Technology (IACSIT)
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White Papers
Wireless Ad Hoc VoIP
Nov 2007
VoIP is one of the traditional application scenarios for Mobile Ad hoc NETworks (MANETs) in settings such as emergency response. Ideally, VoIP would be transparent to the network type such that...
Provided by Association for Computing Machinery
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White Papers
Developing a Security Framework for VoIP Service in IP-Based and Cellular Inter-Network Environment
Oct 2011
The integration of IP-based and Cellular network has lead to increased demand on internet applications. Wi-Fi handsets that are capable of Voice over Internet Protocol (VoIP) services and that can...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Attack Patterns in VoIP
Jul 2007
In VoIP, in order to avoid attacks and discover security vulnerabilities, it is necessary to be aware of typical risks and to have a good understanding of how vulnerabilities can be exploited. In...
Provided by University of Oulu
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White Papers
A First Look on the Effects and Mitigation of VoIP SPIT Flooding in 4G Mobile Networks
Sep 2011
The fourth generation of mobile networks is considered a technology-opportunistic and user-centric system. Part of its new architecture, 4G networks will implement an evolved packet core. Although...
Provided by Concordia University
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White Papers
Speaker Recognition From Encrypted VoIP Communications
Oct 2009
Most of the Voice over IP (VoIP) traffic is encrypted prior to its transmission over the Internet. This makes the identity tracing of perpetrators during forensic investigations a challenging task...
Provided by Reed Elsevier
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White Papers
Covert Channels in SIP for VoIP signalling
Mar 2008
In this paper, the authors evaluate available steganographic techniques for SIP (Session Initiation Protocol) that can be used for creating covert channels during signaling phase of VoIP (Voice...
Provided by Warsaw University of Technology
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White Papers
Steganography of VoIP Streams
Sep 2008
The paper concerns available steganographic techniques that can be used for creating covert channels for VoIP (Voice over Internet Protocol) streams. Apart from characterizing existing...
Provided by Springer Science+Business Media
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White Papers
Analysis of a Procedure for Inserting Steganographic Data Into VoIP Calls
Aug 2008
The paper concerns performance analysis of a steganographic method, dedicated primarily for VoIP, which was recently filed for patenting under the name LACK. The performance of the method depends...
Provided by Warsaw University of Technology
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White Papers
LACK - A VoIP Steganographic Method
Nov 2008
The paper presents a new steganographic method called LACK (Lost Audio PaCKets Steganography) which is intended mainly for VoIP. The method is presented in a broader context of network...
Provided by Warsaw University of Technology
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White Papers
What are Suspicious VoIP Delays?
Feb 2010
Voice over IP (VoIP) is unquestionably the most popular real-time service in IP networks today. Recent studies have shown that it is also a suitable carrier for information hiding. Hidden...
Provided by Warsaw University of Technology
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White Papers
On Steganography in Lost Audio Packets
Jan 2011
The paper presents a new hidden data insertion procedure based on estimated probability of the remaining time of the call for steganographic method called LACK (Lost Audio PaCKets steganography)....
Provided by Warsaw University of Technology
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White Papers
Lost Audio Packets Steganography: The First Practical Evaluation
Jul 2011
This paper presents first experimental results for an IP telephony-based steganographic method called LACK (Lost Audio PaCKets steganography). This method utilizes the fact that in typical...
Provided by Warsaw University of Technology
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White Papers
The Impact of TLS on SIP Server Performance: Measurement and Modelling
Dec 2011
Securing VoIP is a crucial requirement for its successful adoption. A key component of this is securing the signaling path, which is performed by SIP. Securing SIP is accomplished by using TLS...
Provided by Columbia University
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White Papers
Phonotactic Reconstruction of Encrypted VoIP Conversations: Hookt on fon-iks
Apr 2011
In this paper, the authors unveil new privacy threats against Voice-over-IP (VoIP) communications. Although prior work has shown that the interaction of variable bit-rate codecs and...
Provided by University of North Carolina
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White Papers
Testing Dialog-Verification of SIP Phones With Single-Message Denial-of-Service Attacks
Apr 2008
The authors tested several SIP implementations against simple yet effective DoS Cancel and Bye attacks using forged dialog IDs. Their results are worrying and show that a majority of the...
Provided by NEC Laboratories
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White Papers
Protecting SIP Against Very Large Flooding DoS Attacks
Jul 2009
The use of the Internet for VoIP communications has seen an important increase over the last few years, with the Session Initiation Protocol (SIP) as the most popular protocol used for signaling....
Provided by NEC Europe
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White Papers
Capacity Improvement and Analysis of VoIP Service in a Cognitive Radio System
Aug 2010
The authors herein analyze the capacity of Voice Over IP (VoIP) and propose a new method for finding the minimum detection and false-alarm probabilities to ensure the Quality-of-Service (QoS)...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
The VPQ Scheduler in Access Point for Voip Over WLAN
Dec 2011
The Voice over Internet Protocol (VoIP) application has observed the fastest growth in the world of telecommunication. VoIP is seen as a short-term and long-trem transmission for voice and audio...
Provided by Universiti Utara Malaysia
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Product Specs
IP Office Power User: Stay Connected and Productive - Anywhere
Feb 2010
The ultimate in communications accessibility, IP Office Power User enables executives and managers to be as productive as possible in virtually any circumstances. Whether in the office, down the...
Provided by Avaya
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White Papers
Layer 2 Authentication on VoIP Phones (802.1x)
Jun 2008
IP Telephony offers users the ability to log-on anywhere in the world. Although this offers mobile workers great advantages, it presents new challenges for system administrators who need to ensure...
Provided by Siemens
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White Papers
VOIP on Wireless LAN: A Comprehensive Review
Feb 2008
VoIP requires timely servicing of the voice traffic, which is a challenging task in WLANs, even when using QoS enforcement. The use of Wireless LANs (WLANs) is more and more at present. Voice over...
Provided by University of Cambridge
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White Papers
Allworx VoIP
Feb 2009
The Allworx family of IP based telephone systems and VoIP phones are designed to meet the communications and networking needs of typical small businesses, while also simplifying the setup and...
Provided by Allworx Corp.
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White Papers
An Adaptive Receiver Buffer Adjust Algorithm for VoIP Applications Considering Voice Characters
Feb 2009
In this paper, a new adaptive receiver buffer adjust algorithm is proposed for VolP applications with the consideration of voice characters and network conditions. It divides network status into...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
VoIP Service Performance Optimization in Pre-IEEE 802.11s Wireless Mesh Networks
Mar 2008
802.11-based Wireless Mesh Networks are seen as a means for providing last mile connections to Next Generation Networks. Due to the low deployment cost and the mature technology used, they are...
Provided by Karlstad University
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White Papers
A Study on Persistent Scheduling for VoIP Services in UMB System
Jun 2008
In next-generation cellular systems including 3.9G and IMT-Advanced systems, Voice-over-IP (VoIP) services will be provided to users instead of conventional circuit switch-based voice calls. VoIP...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Implementation of Mobile VoIP Using Wireless Broadband
Dec 2008
Companies and individuals are subscribing to multiple data plans for their mobile accessories and connections. An individual may subscribe to everything from a cell phone plan and data plan to a...
Provided by Purdue University
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White Papers
Model-Checking DoS Amplification for VoIP Session Initiation
Jun 2009
Current techniques for the formal modeling analysis of DoS attacks do not adequately deal with amplification attacks that may target a complex distributed system as a whole rather than a specific...
Provided by Illinois Security Lab
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White Papers
Top 10 Reasons for Switching to Hosted Voice for Business
Jun 2010
Experts believe businesses that don't make the switch to VoIP now will be playing catch-up in a few years. When your phone system is hosted on a private, multi-redundant nationwide network,...
Provided by Megapath
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White Papers
Yankee Group: Mobility Powers the Next Wave of Growth for UC
Sep 2010
Today's enterprise is undergoing a significant transformation, moving toward becoming a true Anywhere Enterprise®—a company where the workers can access any information from any device over any...
Provided by Sprint
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White Papers
Product Leadership Award, MPLS Network Service Level Agreements, North America, 2010
Nov 2010
Praising Sprint's innovative and transparent approach to service level agreements for business customers, the global analyst organization Frost & Sullivan has honored Sprint with its 2010 North...
Provided by Sprint
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White Papers
Yankee Group - SIP Trunking Key to UC
Feb 2009
Companies today are undergoing a significant transformation to a more global Anywhere Enterprise™. Unified communications (UC) is a crucial component in this evolution and organizations look...
Provided by Sprint
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White Papers
Call Admission Control: QoS Issue for VoIP
Oct 2007
One of the vital key elements for providing Quality of Service (QoS) for VoIP is the Call Admission Control (CAC) capabilities of the Session Management /Call Session Control Function or gateway....
Provided by Bangladesh University of Engineering & Technology (BUET)
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White Papers
Automated and Scalable QoS Control for Network Convergence
Apr 2010
Network convergence is becoming increasingly important for cost reduction and management simplification. However, this convergence requires strict performance isolation while keeping fine-grained...
Provided by Princeton University
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White Papers
New VoIP Solutions in Windows Embedded CE 6.0 R2
Nov 2007
Windows Embedded CE has been out for a while but the developers at Microsoft have not been resting on their laurels. The embedded team has released an update to Windows Embedded CE 6.0 dubbed...
Provided by Microsoft
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White Papers
Internet QoS Routing With IP Telephony and TCP Traffic
Jan 2010
In this paper, authors propose the use of QoS routing to enhance the support of IP Telephony. The proposed scheme is based on QoS intradomain OSPF routing, an extension of the conventional OSPF...
Provided by University of California
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White Papers
An Enhanced Scheduler for the Guarantee of QoS Multimedia Services in WiMAX Networks
Jul 2009
The rapid deployment of broadband wireless access has led to growing demand for multimedia applications in networks. Efficient sharing of resources becomes an issue especially in wireless networks...
Provided by Tshwane University of Technology
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White Papers
Black Hole Attack Injection in Ad Hoc Networks
May 2008
Ad hoc networks exploit the processing, storage and wireless communication capabilities of mobile devices to create spontaneous and low-cost self-configuring networks. Despite the promises offered...
Provided by Universidad Politecnica de Valencia
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White Papers
Softspeak: Making VoIP Play Fair in Existing 802.11 Deployments
Jan 2011
Voice over IP (VoIP) in 802.11 WIreless networks (WiFi) is an attractive alternative to cellular wireless telephony. Unfortunately, VoIP traffic is well known to make inefficient use of such...
Provided by University of California, San Diego
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White Papers
Softspeak: Making VoIP Play Well in Existing 802.11 Deployments High Speed
Feb 2009
Voice over IP (VoIP) in 802.11 wireless networks (WiFi) is an attractive alternative to cellular wireless telephony. Unfortunately, VoIP traffic is well known to make inefficient use of such...
Provided by University of California, San Diego
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White Papers
Distributed Delay Estimation and Call Admission Control in IEEE 802.11 WLANs
Dec 2007
Voice over WiFi (VoWiFi) will soon be the main alternative to cellular phones. Providing a satisfactory user experience remains difficult, however. This paper focuses on Call Admission Control...
Provided by Columbia University
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White Papers
Providing UMTS Connectivity to PlanetLab Nodes
Dec 2008
Planetlab is widely recognized as being one of the most important Internet-scale testbeds. However, while allowing experimentations involving hundreds of hosts spread all over the world, PlanetLab...
Provided by Association for Computing Machinery
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White Papers
Capacity Evaluation for IEEE 802.16e Mobile WiMAX
Apr 2010
This paper presents a simple analytical method for capacity evaluation of IEEE 802.16e Mobile WiMAXTM networks. Various overheads that impact the capacity are explained and methods to reduce these...
Provided by Washington University in St. Louis
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White Papers
Every Microsecond Counts: Tracking Fine-Grain Latencies With a Lossy Difference Aggregator
Aug 2009
Many network applications have stringent end-to-end latency requirements, including VoIP and interactive video conferencing, automated trading, and high-performance computing - where even...
Provided by Association for Computing Machinery
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White Papers
Maximizing UPS Availability
Jan 2011
Uninterruptible power systems (UPSs) play a vital role in ensuring IT reliability. As a result, their reliability is a crucial consideration too. Any time a UPS fails, mission-critical electrical...
Provided by Eaton
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White Papers
PeerTalk: A Peer-to-Peer Multiparty Voice-Over-IP System
Mar 2008
Multiparty Voice-Over-IP (MVoIP) services allow a group of people to freely communicate with each other via the Internet, which have many important applications such as online gaming and...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Voice Pharming Attack and the Trust of VoIP
Sep 2008
Voice communication is fundamental to the normal operation of the society. The general public have put a lot of trust in voice communication and they have been relying on it for many critical and...
Provided by Association for Computing Machinery
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White Papers
Preserving Caller Anonymity in Voice-Over-IP Networks
Feb 2008
Applications such as VoIP need to provide anonymity to clients while maintaining low latency to satisfy Quality of Service (QoS) requirements. Existing solutions for providing anonymity such as...
Provided by Georgia Institute of Technology
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Whitepapers
Gaining Total Messaging System Visibility With Quest MessageStats and Quest Spotlight on Messaging
May 2010
The workforce depends on an available and secure messaging system to remain productive. Employees who are mobile or geographically dispersed need flexible communications solutions to stay...
Provided by Dell Software
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White Papers
Using the Crowd to Monitor the Cloud: Network Event Detection From Edge Systems
Nov 2009
The authors believe that the most effective way to detect service-level events is by monitoring the end systems where the services are used. This paper describes an implementation of this approach...
Provided by Northwestern University
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White Papers
Security Patterns for Voice Over IP Networks
Aug 2007
Voice over IP (VoIP) has had a strong effect on global communications by allowing human voice and fax information to travel over existing packet data networks along with traditional data packets....
Provided by Academy Publisher
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White Papers
Why and How to Block Skype
Mar 2007
Skype has become a very popular Voice-over-Internet Protocol (VoIP) service that was designed with many smart characteristics. Nevertheless, it also has some security vulnerabilities that can be...
Provided by Helsinki University of Technology
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White Papers
End Device Support for AAA in SIP Conferencing
Oct 2007
This study is a literature survey of current problems and solutions for authentication, authorization and accounting in SIP conferencing, emphasizing the challenges particularly in mobile end...
Provided by Helsinki University of Technology
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White Papers
A Comprehensive Survey of Voice Over IP Security Research
Dec 2010
This paper presents a comprehensive survey of Voice over IP security academic research, using a set of 245 publications forming a closed cross-citation set. The authors classify these papers...
Provided by Columbia University
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White Papers
Securing Internet Telephony: Encrypting Voice With VoIP-Over-VPN
Nov 2009
Voice over Internet Protocol (VoIP) offers tremendous cost-savings for the enterprise by means of reduced or eliminated telephony charges, consolidated network architectures, and reduced network...
Provided by Patton Electronics
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White Papers
VoIP and IP Telephony Considerations
Nov 2009
When examining the benefits and advantages of VoIP and IP Telephony, one must have a basic understanding of the technical workings of a traditional phone circuit. In a traditional analog phone...
Provided by Access Systems
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White Papers
Testing ATAs, Gateways, VoIP PBXs, and Other Signal Processing Elements in VoIP Networks
Jun 2008
To reliably and efficiently handle voice communications, IP networks contain a myriad of signal processing devices including gateways, Analog Telephone Adapters (ATA), and VoIP PBXs. A PSTN / IP...
Provided by GL Communications
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White Papers
SIP Trunking Benefits and Best Practices
Jun 2007
A SIP trunk is a service offered by an ITSP to use SIP to set up communications between an enterprise PBX and the ITSP. A trunk includes multiple voice sessions - as many as the enterprise needs....
Provided by Ingate Systems
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White Papers
The ROI of IP Telephony Management
Feb 2008
Whether companies are just starting, continuing, or finished with the IP telephony deployments, one thing's for certain: They need to manage these newly converged networks. They must deliver voice...
Provided by Nelson Publishing
