voip

Accelerator products can help enterprises a lot in addressing the performance requirements of all enterprise applications including Voice over IP. First, Accelerators change the economics of wide area networking by squeezing an average of 100% - 400% more bandwidth with peaks of 1000% depending on traffic mix. This frees up link bandwidth to support high quality service - and it does it without expensive WAN upgrades.

It is also worthy to note that Accelerators do not actually use lossy compression schemes that might degrade voice quality and they add less than one millisecond of latency. In fact, the Accelerator’s compression actually reduces end-to-end latency by reducing serialization delays on WAN links. For example, it takes 125 ms to serialize a 1,000 byte packet on a 64 kbps link, but if an Accelerator increases the effective bandwidth by 4X to 256 kbps, the serialization delay is reduced by a factor of four to 31 ms. The following formula can be used to calculate the serialization delay for any combination of packet size and link speed:

Packet Size (in bytes) x 8 / Link Speed (in kbps) = Serialization Delay (in ms)

In addition to freeing up the bandwidth normally consumed by data applications, Accelerators are able to reduce WAN bandwidth requirements for different voice over IP codecs. In fact, tests have shown that Accelerators reduced G.711 bandwidth requirements by 20% and G.729 by 70%. As a result, WAN links can carry more simultaneous voice calls and the performance of other applications may also be improved.

Accelerators solve increased jitter and latency caused by large data packets over slow WAN links by fragmenting large data packets and injecting voice over IP packets at regular intervals. This feature allows Voip and data to co-exist even on branch office WAN links. For example, normally, a voice over IP packet “stuck” behind a 1,500 byte packet on a 64kbps lin will be delayed by 188ms.

Using the Accelerator’s packet fragmentation will result in the data packet being reduced in size (accelerated - say from 1500 bytes to 500b bytes) and then fragmented into smaller data packets (say - 2 packets of 250 bytes each). In this case, the latency for the Voip packet will go down from 188 ms to 31ms! In addition to increasing WAN capacity for both data and Voice over IP while reducing latency and jitter, Accelerators also manage WAN bandwidth to ensure that critical applications like voice over IP get the bandwidth they need.

Accelerators include an Instant QoS feature that prioritizes application access to WAN bandwidth. Without such prioritization, the additional effective bandwidth provided by Accelerators could be consumed by aggressive, non-critical applications such as file sharing. Accelerator’s AppView feature provides graphical visibility for all application traffic sharing a link. AppView can be used to monitor WAN utilization and to plan future capacity requirements.

And finally, Accelerators have a set of data integrity features that are designed to stop the packet loss that can degrade voice quality. A flow control mechanism reduces packet loss caused by link congestion and a packet recovery feature ensures that any lost packets are transparently recovered at the link level before they can cause voice quality problems.

Jim Francisto
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IP-Telephony Phone Service

IP-Telephony Phone Service
Have you talked lately with people about business voip or Internet telephony?
Voip seriously changed the world because it enables people to receive phone calls any place with an Internet connection, just like receiving your email .

The possibilities are endless even though we are still in the very preliminary phase of understanding how Voip will change our lives.

It is basically a technology that allows you to make telephone calls through the Internet, instead through the normal phone lines, which is the way that phone calls have been made for decades since the inception of the telephone.

What is Voip?
I am sure that you know that VoIP lets you make extremely cheap telephone calls.
Voip is a new technology which was discovered with the Internet and improved over time.

What you need call with Voip
You only need a fast connection to the Internet

Voip makes life much easier not only for business people. It is no more necessary to have an answering machine or a secretary while you are out of office. Instead, install a software phone onto your laptop and get all your calls and messages directly through your PC with IP-Telephony.

Be mobile with Voip
Students, chat with your parents for free. When you are a student and study far away from home get a local telephone number at the area of the university and make telephone calls home at cheap local rates.

We live in a more and more mobile world. Technology continues to shuttle us into into the future. If you are thinking over to use the Voip technology and it all sounds confusing to you, make the change in modest steps. Sign up with one of the large Voip companies that will connect your regular telephone, through a gateway to the Internet. Once you are comfortable with this, it will just be a matter of time before you are use more complex set ups.

Search the Internet to find the Voip Service which best fits to your needs. There are a many Voip related site with voip provider reviews.