voip

White Papers

Impact of Multi-Rate VoIP on Quality of Service in IEEE 802.11e EDCA With Link Adaptation

June 1, 2007 12:00am PDT

With the deployment of IEEE 802.11 wireless LANs, there is a strong requirement to support real-time applications with stringent QoS requirements on these networks. IEEE 802.11e provides QoS...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Measuring WCDMA and HSDPA Delay Characteristics With QoSMeT

June 1, 2007 12:00am PDT

Quality of Service (QoS) is becoming increasingly important with the rise of multimedia applications (e.g., Voice over IP (VoIP), video conferencing, online gaming, and Internet Protocol...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Performance Evaluation of Quality of VoIP Service Over UMTS-UTRAN R99

June 1, 2007 12:00am PDT

Release99 of UMTS (Universal Mobile Telecommunication System) network supports conversational services by means of UTRAN (Universal Terrestrial Radio Access Network) Dedicated transport CHannels...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

On the Error Floor Performance of SCTCM Systems With Non-Recursive Inner Codes

June 1, 2007 12:00am PDT

It has previously been shown that Serially Concatenated Trellis Coded Modulation (SCTCM) with a non-recursive inner convolutional code can achieve convergence close to capacity. In this paper, the...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

VoIP Capacity Allocation Using an Adaptive Voice Packetization Server in IEEE 802.11 WLANs

June 1, 2007 12:00am PDT

WLAN VoIP capacity is known to be very low due to the effects of overheads at various protocol layers. An IEEE 802.11b Access Point (AP) operating at 11 Mbps for example, can support only about 12...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Study of Best-Effort VoIP Handovers Between WLAN and EVDO Networks

June 1, 2007 12:00am PDT

The IEEE 802.11 based Wireless LANs (WLANs) have emerged as a viable technology for supporting real-time applications such as Voice over IP (VoIP). Even the Personal Digital Assistants and...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

VoIP Performance in SIP-Based Vertical Handovers Between WLAN and GPRS/UMTS Networks

June 1, 2007 12:00am PDT

This paper experimentally analyzes the handover performance of VoIP sessions in a wireless overlay of 802.11 WLANs and GPRS/UMTS networks when mobility is handled at the application layer by SIP....

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Admission Control in Ethernet Passive Optical Networks (EPONs)

June 1, 2007 12:00am PDT

EPONs are designed to deliver services for multiple applications, such as VoIP, standard and high-definition video, interactive video and best effort traffic. The authors present the first...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

VoIP Capacity Over Multiple IEEE 802.11 WLANs

June 1, 2007 12:00am PDT

It is well known that IEEE 802.11 WLAN is highly inefficient for transporting voice data. For example, if one simply takes the data rate of 802.11b, 11Mbps, and divide it by two times 13.2Kbps...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Hybrid Energy-Saving Algorithm Considering Silent Periods of VoIP Traffic for Mobile WiMAX

June 1, 2007 12:00am PDT

Recent broadband wireless access systems apply Voice Over Internet Protocol (VoIP) for their voice services, so a Mobile Station (MS) requires an efficient energy-saving algorithm for VoIP...

Provided by: Institute of Electrical and Electronics Engineers

White Papers

Fast Handover Scheme for Real-Time Applications in Mobile WiMAX

June 1, 2007 12:00am PDT

Mobile WiMAX is one of the most promising technologies for broadband wireless communication. The IEEE 802.16e standard for Mobile WiMAX, the enhanced version of the IEEE 802.16 standard with...

Provided by: Institute of Electrical and Electronics Engineers

Articles

Deploying VoIP: Weigh the pros and cons of convergence

May 31, 2007 7:00am PDT

To converge or not to converge -- that is the question. When deploying VoIP in your organization, should you combine data and voice networks, or should you keep them separate? Deb Shinder weighs...

1

Q&A

Voip over Wireless

May 29, 2007 1:28am PDT

Voip over Wireless Hi, This is probaly my firs question, so please help. I have a sattelite internet in africa, i have 512down/384up link connection. In my main site voip works well, but I expand...

5 Started by faisal.m.saad@...  |  Latest comment by Triathlete1981

White Papers

What Prospects For Institutional Convergence Across Advanced Industrialized Nations? Evidence From the Belief Systems Of Senior Executives In Germany And Japan

May 28, 2007 12:00am PDT

Drawing on a growing body of literature suggesting a linkage between belief systems ("Rationale") and the shape of national institutional structures, the paper explores the possibility of...

Provided by: INSEAD

Discussion Threads

Interop '07: CompTIA launches Convergence certification to meet the demand for VoIP skills

May 24, 2007 3:09am PDT

Interop '07: CompTIA launches Convergence certification to meet the demand for VoIP skills article root Good news for VoiP personnel This event would eventually give a chance for VoIP skilled...

1 Started by mhope@...  | 

Blog Post

Interop '07: CompTIA launches Convergence+ certification to meet the demand for VoIP skills

May 22, 2007 5:36pm PDT

CompTIA launched its new Convergence+ certification at the beginning of April, but it's using Interop Las Vegas 2007 this week to make the pitch for this new program to IT professionals and...

1

Discussion Threads

Why unified communications bring out the best in VoIP

May 22, 2007 5:02pm PDT

Why unified communications bring out the best in VoIP article root Will MS take over the whole UM/VOIP industry? We are about to implement a system built around a solid traditional PBX hybrid...

3 Started by UtdNut  |  Latest comment by vrkprasad@...

Articles

SolutionBase: An overview of Unified Messaging in Exchange Server 2007

May 22, 2007 7:00am PDT

Users need more than e-mail to keep in touch with the outside world; they need access to phones and faxes as well. Brien Posey shows how Exchange 2007 handles the problem of bringing messaging...

Webcasts

Best Practices for Managing Microsoft Exchange Email Archiving and Migrations

May 22, 2007 12:00am PDT

The presenter of this webcast explains how Symantec's Enterprise Vault can help the attendee. Enterprise Vault delivers a comprehensive archiving platform to capture and store email, files,...

Provided by: Symantec

Q&A

One way communication with VOIP

May 21, 2007 4:53am PDT

One way communication with VOIP We have installed a new phone system with a PBX. We have 30 phones "in-house" and plan on using 8 IP phones at various outside locations. We can setup the IP phones...

1 Latest comment by Cush82