Quality of service issues

Article (8)

EDITORIAL: It's time for a Net Neutrality debate
Australia should sort out its position on Net Neutrality before the National Broadband Network is built, not afterwards, writes TechTarget ANZ Editor Simon Sharwood.
Voice over wireless LAN deployment requires constant maintenance
Learn how to monitor, troubleshoot and maintain your voice over wireless LAN (VoWLAN) deployment.
Network configuration management key to VoIP success
While companies spend millions on upgrading infrastructure for VoIP, little attention is given to solving the largest source of downtime â€“ configuration-related outages due to human error. A well-defined change management process built around a configuration management system can virtually eliminate the "self-inflicted" errors, which currently account for about 60% of all network outages.
VoIP user experience tested
Most VoIP monitoring is focused on quality of service, but one new company is taking a different tack and looking at the quality of experience.
Calling network management vendors: It's time to get on board with VoIP
Despite the hype, full-scale VoIP deployments are hard to find. According to our research at Yankee Group, over 80% of U.S. enterprises have VoIP deployed somewhere in their organization in some shape or form. This includes departmental trials and development environments. These kinds of statistics combined with a frenzy of media and vendor hype would leave one with the impression that we're right around the corner from ubiquitous VoIP and if you haven't deployed it yet, you're a luddite and you're putting your business at risk. However, digging a little deeper into our research we discover that a mere 6% of U.S. enterprises have VoIP running throughout their organization and caution is more the norm than the exception.
Is there a generic blueprint for an IP-based call center?
Is there a generic blueprint for an IP-based call center? Where could I find one?
Managing converged networks: The next challenge
Enterprises are well-versed managing separate voice and data infrastructures, but they do not have the tools and training necessary to manage SIP-based VoIP and multimedia applications. To take advantage of this technology, a new breed of IP expert must be trained to architect, implement and troubleshoot the converged IT environment at the session layer.
VoIP call quality declines
Advances in technology have made VoIP more common, but that hasn't stopped VoIP call quality from dropping steadily over the last 18 months, according to a recent study by Brix Networks.

Columns (1)

Calling network management vendors: It's time to get on board with VoIP
Lack of reliable VoIP management tools is holding up full-scale VoIP deployments.

Tips (9)

Voice quality and MOS
Defining the nine elements of voice quality and Mean Opinion Score (MOS), the standard numeric value used to measure and report on voice quality.
Updating a QoS strategy for VoIP traffic
Learn how to update your QoS strategy for VoIP traffic in this tip from Tom Lancaster.
QoS -- What voice managers need to know
Quality of Service (QoS) technologies can be quite confusing between technical complexities and marketing jargon. In this tip, find out what voice managers need to know about QoS as it relates to VoIP.
When should a VoIP system be analyzed and with what tools?
We have recently implemented a VoIP network with separate VLANs and QoS. It all seemed to be working fine when it first went in, but recently, certain people have been complaining about sound breakup whilst talking to customers on the phone. I have also had similar problems, but thought it was due to the amount of diagnostics software that I was running on my PC. To check, I moved my phone into its own port and the breakup is still there. Any ideas how we can check to make sure that the network is doing alright? Also are there any software utilities that would help us with day to day analyzing?
Why is UDP used more in VoIP than TCP?
If UDP is unreliable, why is it used more in VoIP rather than TCP?
Is SIP really better than HTTP? Follow-up to why use SIP.
In a previous question, I asked why should I use SIP when my application built on HTTP works fine. You replied that SIP provides URL dialing. Yet, so does my application, with better session routing for all packets. Would you please elaborate? Can you give me any idea how much it will cost me to setup a SIP environment in an office, with SIP proxy and registration? How much will a STUN/TURN server cost? How much does heavy client of SIP increase the price of a telephone set?
How does the service provider differentiate between data and VoIP as data?
For our mobile devices in trucks, we use GSM/GPRS communication. Our customers are paying for a certain data amount -- depending on the service package to which they subscribe. We use a modem in our device, which can do both data and voice. But as I understand it, with VoIP, everything becomes data. So, is it cheaper for the user if they use VoIP? How will operators handle this from a business model perspective? Will they expand the data amount packages or will they need to differentiate between "regular" data and VoIP data? And a technical question: how much VoIP data am I consuming if I have a one minute voice conversation?
How can choppiness during a phone call be eliminated?
I have a WAN that consists of two LANS. On that network there are two Toshiba phone switches. I wouldn't say that it is a VoIP system as the individual terminals are digital. For some reason we sporadically experience some choppiness in the calls from node to node; the choppiness is not quite a delay or an echo -- it seems more like a broken call. I have verified the priority of voice on the routers as well as the timing. But the problem still occurs and it is frustrating when it occurs on conference calls. Is there anything else that we may be missing that could be improved on this situation?
Does Spanning Tree Protocol have an adverse effect on VoIP?
Do you know if Spanning Tree has an adverse effect upon VoIP? If so, what is the best way to provide LAN-based switch redundancy to VoIP gateways?

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