ip telephony

Case Studies

Cisco on Cisco: Cisco Unified Communications on Cisco Unified Computing System

March 9, 2011 12:00am PST

Rapid growth in Cisco's employee user base combined with new ways of working put additional processing demand on the IT department's communication services. Their challenges are to provide...

Provided by: Cisco

Whitepapers

Gartner "Magic Quadrant" examines communication services vendors

March 8, 2011 12:00am PST

Selecting a vendor for telecommunications and IT network services can be complex - and can have an enormous impact on your organization. Communications services are important to your operation,...

Provided by: IBM

Whitepapers

Unified communications and collaboration solutions from IBM

March 8, 2011 12:00am PST

Communication and collaboration - among customers, partners and employees can help your organization stay ahead of the competition. But implementing effective and cost-effective collaboration...

Provided by: IBM

White Papers

Near-Capacity H.264 Multimedia Communications Using Iterative Joint Source-Channel Decoding

March 2, 2011 12:00am PST

In this tutorial, a unified treatment of the topic of near capacity multimedia communication systems is offered, where the authors focus their attention not only on source and channel coding but...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Securing IP-Multimedia Subsystem (IMS) Against Anomalous Message Exploits by Using Machine Learning Algorithms

March 1, 2011 12:00am PST

Modern communication infrastructure (IPMultimedia Subsystem (IMS) and Voice over IP (VoIP)) are vulnerable to zero day attacks and unknown threats. Anomalous SIP requests can be used to remotely...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

The Link Between Mobile Telephony Arrears and Credit Arrears

March 1, 2011 12:00am PST

At the request of the Minister for Climate and Energy, Paul Magnette, who is also responsible for Consumer Affairs, the NBB's Microeconomic Analysis Service conducted an investigation into the...

Provided by: National Bank of Belgium

White Papers

Efficient Control Channel Resource Allocation for VoIP in OFDMA-Based Packet Radio Networks

February 28, 2011 12:00am PST

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

White Papers

Microeconomic Consequences Of Exemptions From Value Added Taxation ? The Case Of Deutsche Post

February 24, 2011 12:00am PST

The exemption for Value Added Taxation (VAT) can be used to pursue distributive objectives. Goods like food, housing, medicine, or infrastructure services (water, telecommunication, postal) are...

Provided by: Leuphana Universität Lüneburg

Whitepapers

Experimental Characterization of VoIP Traffic Over IEEE 802.11 Wireless LANs

February 22, 2011 12:00am PST

Voice over Internet Protocol (VoIP) technology has become a potential alternative to and also a supplement of the traditional telephony systems over the Public Switched Telephone Network (PSTN),...

Provided by: Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)

White Papers

Dense Wavelength Multiplexing of 1550 Nm QKD With Strong Classical Channels in Reconfigurable Networking Environments

February 17, 2011 12:00am PST

To move beyond dedicated links and networks, quantum communications signals must be integrated into networks carrying classical optical channels at power levels many orders of magnitude higher...

Provided by: Telcordia Technologies

White Papers

A Comparative Survey of Adaptive Codec Solutions for VoIP Over Multirate WLANs: A Capacity Versus Quality Performance Trade-Off

February 17, 2011 12:00am PST

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

Image Gallery

Telecom chieftans tout mobile future (photos)

February 15, 2011 6:10am PST

A host of top telecom executives took the stage at Mobile World Congress to explain their technology, business, and anti-regulatory fervor.

Case Studies

Tata Teleservices Limited: Telecom Giant Reduces Power Consumption and Costs With Upgraded PC Environment

February 11, 2011 12:00am PST

Tata Teleservices Limited (TTL) spearheads the Tata Group's presence in the telecom sector. One of the fastest growing telecom service providers in India, TTL serves approximately 85 million...

Provided by: Microsoft

White Papers

Implementation of the SIP Express Router With Mediaproxy Method on VoIP

February 10, 2011 12:00am PST

Voice over IP (VoIP) is a technology that could pass the voice traffic and data packet form over an IP network. Network can be used for intranet or Internet. Phone calls using VoIP has advantages...

Provided by: World Academy of Science, Engineering and Technology

White Papers

Temporal Starvation in CSMA Wireless Networks

February 10, 2011 12:00am PST

It is well known that links in CSMA wireless networks are prone to starvation. Prior works focused almost exclusively on equilibrium starvation. In this paper, the authors show that links in CSMA...

Provided by: Chinese University of Hong Kong

White Papers

Structuring the Smartphone Industry: Is the Mobile Internet OS Platform the Key?

February 10, 2011 12:00am PST

Until the introduction of the iPhone, cellular telephony and the Internet were essentially separate. The Internet was a PC-based service, while mobile telephony was conducted on a telephone....

Provided by: ELINKEINOELÄMÄN TUTKIMUSLAITOS

White Papers

Improved Performance of the Basic Array of a Microstrip Adaptive Antenna Using a Tree Structure of Patch Fed by Electromagnetic Coupling

February 6, 2011 12:00am PST

The aim of this paper is to improve the performance of a basic microstrip antenna array using a tree structure patch supplied by electromagnetic coupling. The developed network which contains two...

Provided by: Beijing University of Posts and Telecommunications

Case Studies

School District Reduces Telephony Costs With Communications Solution

February 3, 2011 12:00am PST

Oxnard Union High School District serves eight high schools and 17,000 students across three cities in central California. The district wanted to replace its private-branch exchange system with a...

Provided by: Microsoft

White Papers

A Voice Priority Queue (VPQ) Fair Scheduler for the VoIP Over WLANs

February 2, 2011 12:00am PST

Transmission of VoIP over packet switching networks is one of the rapidly emerging real-time Internet Protocol. The real-time application of the Voice over Internet Protocol (VoIP) is growing...

Provided by: Universiti Teknologi PETRONAS

White Papers

Evolution Of Technological Capabilities: A Study Of Indian Products Based Telecom Start-up Firms

February 1, 2011 12:00am PST

New technology based start-ups play a very important role in developing the economy of a country. However, product based B2B start-ups in India are rare and existing ones have to undergo several...

Provided by: Indian Institute of Management Ahmedabad