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voip - ip telephony
(1230 results)-
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
The Path to Secure Remote Access
Jun 2007
Small- and Medium-Sized Businesses (SMBs), like the enterprise big siblings, have a growing number of reasons to want to support secure remote access to the company network. Employees want access,...
Provided by CDW
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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
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 Quest Software, now a part of Dell
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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
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
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White Papers
Implementing the VoIP Network: A Technical Briefing on VoIP and Converged Networks
Jun 2007
The majority of today's businesses are willing to pilot VoIP in one or two locations, but very few companies have installed it as their primary voice solution. As enterprises get closer to full...
Provided by Network General
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Case Studies
Extreme Networks Provides Availability and Reliability Required for Customers of Leading Finnish Service Provider
Sep 2008
Xenetic, Inc. provides managed business-critical Information and Communications Technologies (ICT) services that require around-the-clock availability. The main challenge is that they required, a...
Provided by Extreme Networks
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Case Studies
France Telecom (Orange) - Mobile API Publishing
Jan 2011
Orange is the key brand of France Telecom, one of the world's leading telecommunications operators. The local developers need full advantage of tools and resources of the Nursery and through...
Provided by Layer 7 Technologies
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White Papers
Impact of 4G Wireless Link Configurations on VoIP Network Performance
Aug 2008
The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics vary with frame retransmission persistency, link frame retransmission...
Provided by Uppsala University
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White Papers
Gateway Strategies for VoIP Traffic Over Wireless Multihop Networks
Jan 2011
When supporting both voice and TCP in a wireless multi-hop network, there are two conflicting goals: to protect the VoIP traffic, and to completely utilize the remaining capacity for TCP. The...
Provided by Stony Brook University
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White Papers
Voice Adaptive Gateway Pacer for Wireless Multihop Networks
Jul 2010
When supporting both voice and TCP in a wireless multi-hop network, there are two conflicting goals: to protect the VoIP traffic, and to completely utilize the remaining capacity for TCP. The...
Provided by University Politehnica of Bucharest
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White Papers
Exploring Wireless Mesh Networks for Collaborative Augmented Reality Environments
Jun 2010
Augmented Reality (AR) has emerged as a technology able to greatly support the interaction between people and digital information by merging virtual objects with the real environment. So far,...
Provided by Lund University
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White Papers
Super Nodes Positioning for P2P IP Telephony Over Wireless Ad-Hoc Networks
Dec 2007
IP Telephony is a potential killer application among the various multimedia applications and services. It is therefore natural to expect support for these services over new network architectures...
Provided by Association for Computing Machinery
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White Papers
Modeling Call Arrivals on VoIP Networks as Linear Gaussian Process Under Heavy Traffic Condition
Jun 2011
The authors propose a new model for call arrival process on VoIP tandem networks under heavy traffic condition. Based on empirical evidence, such call arrivals can be modeled as linear Gaussian...
Provided by DePaul University
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White Papers
Modeling and Performance Analysis of Telephony Gateway Registration Protocol
Jul 2007
Telephony gateways are devices that interface between IP telephony networks and the PSTN. A telephony proxy or Location Server (LS) that attempts to connect a call for an end user may need to...
Provided by Indian Institute of Technology Bombay
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White Papers
Performance Optimization of Mobile WiMAX Netwoks for VoIP Streams
Jun 2011
Supporting as many VoIP (Voice over Internet Protocol) users as possible in a BWA (Broadband Wireless Access) network, using limited radio resources is a very important issue that could lead the...
Provided by Universidad Nacional Autonoma de Mexico
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White Papers
Influence of Network Load on the Performance of Opportunistic Scanning
Aug 2009
This paper presents a detailed performance evaluation of a novel stochastic network discovery approach denoted as opportunistic scanning. Therein, a station only pauses its communication for an...
Provided by Technische Universität Berlin
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White Papers
Analyzing the Impact of Various Wireless Network Conditions on the Perceived Quality of VoIP
Apr 2010
This paper focuses on a comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover and under different background traffic conditions at a...
Provided by University of Crete
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White Papers
Single-Ended Parametric Voicing-Aware Models for Live Assessment of Packetized VoIP Conversations
Nov 2009
The perceptual quality of VoIP conversations depends tightly on the pattern of packet losses, i.e., the distribution and duration of packet loss runs. The wider (resp. smaller) the inter-loss gap...
Provided by Universität Tübingen
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White Papers
Improvement of Handover Break Time Performance for Wireless Broadband Access System
Oct 2007
Handover break time is a critical performance measure to warrant the seamless mobility, especially for the real-time service, e.g., Voice over IP (VoIP) service, in the wireless broadband access...
Provided by Korea University
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White Papers
Efficient Control Channel Resource Allocation for VoIP in OFDMA-Based Packet Radio Networks
Feb 2011
The authors propose an efficient control channel resource allocation approach to enhance the performance of Voice-over-IP (VoIP) in Orthogonal Frequency Division Multiple Access- (OFDMA-) based...
Provided by Tampere University of Technology
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White Papers
A Comparative Survey of Adaptive Codec Solutions for VoIP Over Multirate WLANs: A Capacity Versus Quality Performance Trade-Off
Feb 2011
In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause...
Provided by Universitat Pompeu Fabra
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Case Studies
Toshiba VoIP System Delivers Peace of Mind for Yavapai-Apache Nation
Sep 2008
The Yavapai-Apache Nation is a sovereign Native American Nation from the Verde Valley in Arizona. Their challenge is to connect 26 Buildings Wirelessly Over 45 Square Miles. When their old...
Provided by Toshiba
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Case Studies
Lightning Is No Foe for Toshiba VoIP System at Lake Highland Preparatory School
Jul 2008
Lake Highland Preparatory School (LHPS) is an independent college preparatory school. Their mission is to create lightning-resistant VoIP System. They chose Toshiba to overcome these challenges....
Provided by Toshiba
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Case Studies
Strata CIX VoIP Business Communication System
Oct 2008
Feather River College is located in the small town of Quincy in Northern California. The college needed a new voice communication system to handle the hundreds of calls it receives each week....
Provided by Toshiba
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White Papers
Empirical Modeling and Estimation of End-to-End VoIP Delay Over Mobile Multi-Hop Wireless Networks
Oct 2010
Voice-over-IP (VoIP) systems face the following two general constraints: a stringent end-to-end delay constraint of at most 500 ms has to be satisfied, including not only the end-to-end networking...
Provided by UC Regents
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White Papers
Towards High Quality VoIP in 3G Networks an Empirical Approach
Nov 2008
Third Generation (3G) packet switched WCDMA networks with High-Speed Downlink Packet Access (HSDPA) are currently being deployed worldwide to provide wireless broadband connectivity. When...
Provided by Scientific Research Publishing
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Whitepapers
Nemertes Research PilotHouse Awards: IP Telephony
Sep 2011
For the past eight years, independent research firm, Nemertes Research, has surveyed IT professionals for its annual benchmark on IP telephony using notable evaluation criteria. Each year,...
Provided by ShoreTel
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Whitepapers
Comparison of Avaya and ShoreTel Unified Communication Solutions
Sep 2011
Unlike ShoreTel's all-in-one, all-IP solution, the Avaya platforms have been adapted from legacy technology and assembled piecemeal. The result is a complex solution that can require extensive...
Provided by ShoreTel
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Whitepapers
Comparison of Cisco and ShoreTel Unified Communication Solutions
Sep 2011
Unlike ShoreTel's all-in-one, all-IP solution, the Avaya platforms have been adapted from legacy technology and assembled piecemeal. The result is a complex solution that can require extensive...
Provided by ShoreTel
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White Papers
Taking Voice to the Next Level
Oct 2011
Communication across globally dispersed teams can be a challenge. This is particularly true if each location has a different phone system with its own unique features, quirks and reliability...
Provided by CDW
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White Papers
VoIP and Beyond: UC's productivity promise
Oct 2011
Combining voice and data networks is hardly news. Yet, some organizations remain tied to private branch exchange (PBX) systems that are nearing their "sell by" date. As communication technologies...
Provided by CDW
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White Papers
Empirical Modelling of the Mobile VoIP Demand
Mar 2008
This paper first discusses the future of mobile Internet voice and possible technical service evolution paths. Three main fundamental drivers of mobile VoIP (Voice over IP) diffusion are...
Provided by Helsinki University of Technology
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White Papers
Performance Analysis of VoIP Codecs Over BE WiMAX Network
Jun 2010
IEEE802.16 technology due to its outstanding larger coverage area, high data rates, inexpensive equipments, ease of deployment and guaranteed QoS make it a suitable candidate for future broadband...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Distributed Scheduling Algorithm With QoS Provisions in Multi-Hop Wireless Mesh Networks
Aug 2008
Multi-hop Wireless Mesh Networks (WMNs) are considered a promising technology to backhaul heterogeneous data traffic from wireless access networks to the wired Internet. WMNs are expected to...
Provided by Imperial College London
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Case Studies
Least Cost Call Routing (LCR)
Jan 2011
Workmethods' client is a fast-growing VOIP company, was initially performing the routing decisions by hard coding the routes into the system until it added several new suppliers for call...
Provided by workMETHODS
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Whitepapers
Implementing Fax over IP in your Organization
Sep 2011
Once voice systems have migrated to VoIP, fax communications are the next logical addition to an IP-based environment. This white paper discusses how fax servers and new FoIP investments fit into...
Provided by OpenText
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Podcasts
Bringing Fax to the 21st Century Podcast
Sep 2011
This podcast provides a general overview of Fax over IP, including the basic information necessary to jump start your research into implementing and deploying a cost-effective FoIP solution.
Provided by OpenText
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White Papers
Moving toward unified communications - Pave the way for the future with Adobe® Connect™ 8
Sep 2011
The communications technology industry has been working toward a vision of unified communications (UC) in which voice, video, and data services truly converge on a single, shared IP-based...
Provided by Adobe Systems
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White Papers
Optimal Placement of Gateways in Vehicular Networks
Aug 2009
In vehicular networks, mobile users in vehicles can access the Internet and enjoy various kinds of services such as Voice over IP (VoIP) and online streaming video. To provide satisfactory Quality...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
An Enhanced SIP Proxy Server for Wireless VoIP in Wireless Mesh Networks
Jan 2008
The Wireless Mesh Network (WMN) has emerged recently as a promising technology for next-generation wireless networking. In WMNs, it is important to provide high quality multimedia service in a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
VoIP Network Architectures and Impacts on Costing
Apr 2010
This paper aims to describe the effect of VoIP network architectures on the cost modelling of termination rates of VoIP services. The paper investigates and organises the arguments available in...
Provided by Emerald Group Publishing
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White Papers
Using Power Over Ethernet to Reduce Network Energy Consumption
Sep 2011
Power over Ethernet (PoE) technology has become an increasingly important tool for simplifying network deployment while improving overall energy efficiency. The latest advances have presented new...
Provided by Microsemi
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White Papers
Providing Interoperability Of, and Control Over, Quality of Service Networks for Real-Time Audio and Video Devices
Jul 2009
In the IT industry there is a trend towards the convergence of the transportation of different types of content to single networking technologies. Web, e-mail and VoIP applications all use a...
Provided by Rhodes University
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Whitepapers
Virtualisation strategies using fax over IP and fax gateways
Sep 2011
Computer virtualisation is a revolutionary concept that provides organisations with a powerful, simple and cost-effective alternative to traditional IT infrastructures. This paper discusses the...
Provided by OpenText
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Whitepapers
Implementing fax over IP in your organisation
Sep 2011
Once voice systems have migrated to VoIP, fax communications are the next logical addition to an IP-based environment. This white paper discusses how fax servers and new fax over IP (FoIP)...
Provided by OpenText
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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
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White Papers
Implementing the VoIP Network: A Technical Briefing on VoIP and Converged Networks
Jun 2007
The majority of today's businesses are willing to pilot VoIP in one or two locations, but very few companies have installed it as their primary voice solution. As enterprises get closer to full...
Provided by Network General
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Whitepapers
Content-Based Detection and Prevention of Spam Over IP Telephony - System Design, Prototype and First Results
Apr 2011
Spam over IP-Telephony (SPIT) may emerge as a major threat requiring effective protection mechanisms. A number of anti-SPIT frameworks have been proposed in the last years. These are mainly based...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Implementation of Blake and RSA in a Fast Authentication Protocol for Wireless Mesh Networks on FPGA
May 2012
Encryption techniques like BLAKE and RSA is implemented in a fast authentication protocol based on tickets, which supports fast handoff mainly in real time applications like VoIP in Wireless Mesh...
Provided by International forum of researchers Students and Academician
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Whitepapers
An Optimized Handover Scheme for WIMAX
Aug 2011
WiMAX is a Broadband Wireless Access (BWA) scheme based on IEEE 802.16. This technology aims at providing last mile access to internet and data services. IEEE 802.16d standard provides fixed...
Provided by International forum of researchers Students and Academician
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White Papers
Voice over IP (VoIP) Implementation Guide for Network Performance Management
Nov 2005
The long-hyped convergence of voice and data onto a single network is finally becoming reality. Major industry magazines and analysts are now discussing the explosion of VoIP deployments, and...
Provided by NetScout Systems
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White Papers
An Improved Packet Loss Recovery in VoIP Using Combined Source and Receiver Based Technique
Nov 2009
Voice over Internet Protocol is an upcoming technology that enables voice communication through the Internet. The transmission of audio data over packet switched networks faces lot of difficulties...
Provided by Academy Publisher
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White Papers
IMS Architecture for 3G Mobile and PC Audio/video Convergence
Oct 2007
One of the most discussed challenges that worldwide carriers are facing today is the telecommunication networks convergence. Third generation mobile networks and broadband access to the Internet...
Provided by Mirial
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White Papers
Premise-Based Optimization: How It Works
Jan 2008
Even though business use of the Internet has grown tremendously over the last decade, little of that growth has come from the use of advanced applications like VoIP, office-to-office transactions,...
Provided by Internap Network Services
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White Papers
The True Value of VoIP
Jan 2008
VoIP evolved gradually over the next few years, reaching the point where some small companies were able to offer PC-to-phone service in about 1998. Phone-to-phone service soon followed, although...
Provided by FrontRange Solutions
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White Papers
Securing Voice Over IP Systems
Nov 2010
The increasing popularity of Voice Over IP (VOIP) for businesses inevitably leads to an increased focus on the security of VOIP as a business technology. VOIP is, broadly, subject to the same...
Provided by Redscan
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White Papers
Paving the Way to Next Generation Media and Signaling VoIP Gateways
Dec 2008
VoIP is changing quickly with the rapid adoption of SIP and the distribution of network elements. As VoIP evolves, connectivity between different signaling protocols, conversion between voice...
Provided by Dialogic
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White Papers
IP Phone Features That Will Make Your Life Better
Jul 2007
VoIP has plenty of mainstream appeal for business, but many companies have yet to discover the perks of IP phones. In fact, research firm In-Stat found that while total IP phone annual shipments...
Provided by Tippit
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White Papers
Converged Billing for ISPs
Jul 2008
ISP stands for Internet Service Provider. Till now they are renowned for providing only internet access to the subscribers but the decade of 2000 is seeing growth of local loop telephony companies...
Provided by AdvancedVoIP
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White Papers
The Fast SIP Registration Method Using MAC Address in VoIP System
Sep 2009
In this paper, the authors propose the SIP Registration method using MAC address in VoIP system. In the process of registering from SIP terminal to the SIP server, the SIP server requests the MAC...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Voice Over IP Security: Issues and Answers
Oct 2007
Voice over Internet Protocol (VoIP) is an increasingly popular technology that allows participants to make telephone calls using a broadband Internet connection rather than a traditional analog...
Provided by IDG (International Data Group)
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White Papers
Deploying VoIP in Existing IP Networks
Jan 2008
Many network managers find it attractive and cost effective to merge and unify voice and data networks. A unified network is easier to run, manage, and maintain. However, the majority of today's...
Provided by King Fahd University of Petroleum & Minerals
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White Papers
VoIP for the Small Business: Reducing Your Telecommunications Costs
Oct 2009
Voice over Internet Protocol (VoIP) has become a viable solution for even the smallest of companies as broadband internet access has become affordable and much more widespread. VoIP offers a low...
Provided by Advanced Managed Solutions
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White Papers
Voice Calls Over Wi-Fi
Oct 2009
The use of Wi-Fi enabled cell phones to access internet away from the PC is increasing day-by-day. The use of Wi-Fi enabled phones as IP phones, and their communication within a local wireless LAN...
Provided by SSN College of Engineering
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White Papers
An Analytical Simulator for Deploying IP Telephony
Dec 2008
Deploying IP telephony or Voice over IP (VoIP) is a major and challenging task. This paper describes an analytical design and planning simulator to assess the readiness of existing IP networks for...
Provided by King Fahd University of Petroleum & Minerals
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White Papers
Secure IP Telephony Using Multi-Layered Protection
Jan 2011
This paper presents the design and analysis of a multilayer protection scheme against Denial-of-Service (DoS) attacks in IP telephony enabled enterprise networks. While there are many types of DoS...
Provided by University of California
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White Papers
Voice Over IP: Improving the Quality Over Wireless LAN by Adopting a Booster Mechanism
Nov 2007
The performance of unreliable voice transmission (Voice over IP) over wireless links is measured not by the throughput but by the perceptual speech quality. The speech quality is impaired by...
Provided by Technische Universität Berlin
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White Papers
VoIP Networks Performance Analysis With Encryption Systems
Dec 2009
The VoIP networks as alternative method to traditional PSTN system has been implemented in a wide variety of structures with multiple protocols, codecs, software and hardware - based...
Provided by World Academy of Science, Engineering and Technology
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White Papers
A Survey on Voice Over IP Over Wireless LANs
Dec 2010
Voice over Internet Protocol (VoIP) is a form of voice communication that uses audio data to transmit voice signals to the end user. VoIP is one of the most important technologies in the World of...
Provided by World Academy of Science, Engineering and Technology
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White Papers
VoIP and Database Traffic Co-Existence Over IEEE 802.11b WLAN With Redundancy
Jun 2009
This paper presents the findings of two experiments that were performed on the Redundancy in Wireless Connection Model (RiWC) using the 802.11b standard. The experiments were simulated using OPNET...
Provided by World Academy of Science, Engineering and Technology
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White Papers
Traffic Behaviour of VoIP in a Simulated Access Network
Jun 2009
Insufficient Quality of Service (QoS) of Voice over Internet Protocol (VoIP) is a growing concern that has lead the need for research and study. In this paper the authors investigate the...
Provided by World Academy of Science, Engineering and Technology
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White Papers
SOVoIP: True Convergence of Data and Voice Network
Jan 2011
Voice over Internet Protocol (VoIP) is the reality of future telephony provided over the Internet. In the process it is claimed that, voice and data networks are converging into one network....
Provided by University of Melbourne
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White Papers
Demonstration of Unobservable Voice Over IP
Apr 2008
This paper describes UV: a two-node system for unobservable voice communication on the Internet. UV provides unobservability of communication by hiding the fact that there is a conversation taking...
Provided by Katholieke Universiteit Leuven
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White Papers
Network-Initiated Terminal Mobility in Voice Over 3GPP-WLAN
Feb 2008
This paper proposes a Network-Initiated Terminal Mobility mechanism (NITM) to facilitate handover with the Session Initiation Protocol (SIP) in 3GPP Voice over WLAN (3GPP VoWLAN). The authors...
Provided by National Chung Cheng University
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White Papers
Voice Over Internet Protocol (VOIP) - Future of Communication
Mar 2008
During the recent Internet stock bubble, articles in the trade press frequently said that, in the near future, telephone traffic would be just another application running over the Internet. Such...
Provided by RIMT - Institute of Engineering & Technology
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Whitepapers
Evaluating P2PSIP Under Attack: An Emulative Study
Mar 2009
Recently, establishing a VoIP call using a P2P network instead of regular SIP-servers has been proposed; this novel approach to SIP-signaling is commonly referred to as P2PSIP and technically...
Provided by University of Haifa
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Whitepapers
Conversation Analysis of Multi-Party Conferencing and Its Relation to Perceived Quality
Apr 2011
This paper investigates interactivity in multi-party conferencing. To this aim the state model often used to describe two-party telephone conversations is extended to more than two interlocutors....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Downlink Coordinated Beamswitching for VoIP Traffic
Jul 2010
The next generation of wireless networks (e.g., Long Term Evolution (LTE) and WiMAX) uses multiple techniques to improve channel spectral efficiencies. In this paper, the authors focus on one such...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Downlink VoIP Capacity With Network-Synchronized Cyclic Beamswitching
Mar 2010
The next generation of wireless networks (e.g., Long Term Evolution (LTE) and WiMAX) use multiple techniques to improve channel spectral efficiencies. In this paper, the authors focus on one such...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the VoIP Capacity of an OFDMA Uplink
Apr 2008
The next generation of wireless networks (4G) will use OFDMA (Orthogonal Frequency-Division Multiple Access) technology on both forward and reverse links. In addition to high speed data services,...
Provided by Huawei Technologies
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Whitepapers
VoIP Capacity Model for the 1xEV-DO Uplink
Aug 2007
In this paper, the authors consider the reverse traffic channel of the 1xEV-DO Revision A wireless network standard. They develop an analytic model for determining the VoIP capacity of this...
Provided by Huawei Technologies
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Whitepapers
VoIP Capacity Model for an OFDMA Downlink
Aug 2007
In traditional wireless networks, voice service is supported with synchronous power controlled channels and hence latency requirements were easily met. Fourth Generation Networks (3GPP2, 3GPP,...
Provided by Huawei Technologies
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Whitepapers
Wimax Testbed for Interconnection of Mobile Navy Units in Operational Scenarios
Oct 2008
The paper refers to the particular scenario where a set of naval units forms a WiMAX-based Mobile Ad hoc NETwork (MANET) to permit the communications among users on board of them and the sharing...
Provided by Institute of Electrical & Electronic Engineers
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White Papers
Business Grade Internet Phone Service Must Be Done a Different Way
Sep 2008
Currently, Small to Midsized Businesses (SMB) use the legacy Public Switched Telephone Network (PSTN) phone company for voice and fax services. Because of long standing government sanctioned...
Provided by Star2Star Communications
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White Papers
Design and Implementation VoIP Service on Open IMS and Asterisk Servers Interconnected Through ENUM Server
Jun 2010
Asterisk and Open IMS use SIP signal protocol to enable both of them can be connected. To facilitate both relationships, Enum server-that is able to translate the numbering address such as PSTN...
Provided by Telkom
