.: IP PBX and Its Uses
By:San
Category:Home / Technology / VOIP
The integrated voice features, for example unified messaging and "click-to-dial", became available with circuit-switched PBX systems. Complex coordination of voice and data networking environments are required. IP network level however, eliminates much of this complexity, attaining results which are lower costs from consolidating equipment and rapid integration with business applications. The requirements necessary for IP PBX systems to successfully integrate with a packet network are:
-Reliability to minimize the loss of voice packets and control network delay.
-Quality of Service (QoS) to ensure that voice packets are transmitted through each network element with the correct priority relative to other types of packets.
Real Time Protocol (RTP)
RTP uses a set of Internet Engineering Task Force (IETF) standard protocols for reliably transporting voice, video, and data among participating parties across a packet network. Comments requests include:
-The RTP protocol (RFC 2550), carrying voice that has been encoded using ITU G.711 or an alternative codec system. The protocol includes time stamps and sequence numbers, "jitter management".
-RTP for dual tone multi-frequency digits carries encoded tones used in interactive voice response (IVR) applications.
-RTP for redundant audio data specifies a mode of transporting same sequenced audio patterns to effectively reduce the number of packets transmitted.
H.323
H.323 - a set of related ITU recommendations that describe the architecture for multimedia communication over a packet-switched network. Key factors:
-H. 323, defining the multimedia infrastructure, including the role of devices, gateways and gate keepers.
-H. 245, specifying the call control processes for establishing and terminating a multimedia session, which includes the exchange of the capabilities supported by client devices.
-H. 450, specifying a set of supplementary devices, like call transfer, hold, message waiting etc. This protocol is useful communication between clients without the aid of a switch.
Session Initiation Protocol (SIP)
SIP is an IETF standard protocol helpful for initiating an interactive user session that carries multimedia subjects. The SIP architecture comes with a method for delivering connections for users at any location where he/she is registered. In contrast to the H.323, SIP uses an extensible text-based format, similar to HTTP. SIP, being the basis for multi applicable programs including instant messaging and gaming. It can function as a standalone call control protocol or together with H. 323.
Article keywords: IP PBX, SIP, VoIP, Ethernet
Article Source: http://www.articles32.com
Article contributed by Phil Lam who is a VoIP consultant at Lantone Communications. Led by a team of experienced IT developers, Lantone Communications is one of the leadingVoIP Provider in Singapore. Please visit their official website for the latest information on VoIP.
This article may be reprinted in its original form as long as the resource box is left intact and the links live and the article is not to be modified in any way.
.: New VOIP Articles
1). 6 Voice Over IP Tips
There are many benefits to VoIP. Here are 6 benefits we found to voice over ip. You may be able to think of even more reasons to switch or to include this exciting way to communicate at reduced prices.
2). Top 10 Reasons You Should Switch To VoIP
If you are considering changing to voice over internet protocol or VoIP for short you need to know the arguments for changing. Here are our top 10 reasons to switch to VoIP.
3). 7 Good Reasons Not To Switch To Voice Over IP Technology
For every positive there is a negative when it comes to voice over ip technology. Here are 7 good reasons not to switch in spite of the savings you may realize.
4). How To Choose The Best Voice Over Ip Provider
Choosing the best voice over ip provider may require you to do something that you have never done before. Here are a few tips to help you choose the best voice over ip provider.
5). Residential VoIP: Things to Consider Before Switching
Choosing VoIP over traditional telephone services has its pros and cons just like anything else. It is up to the consumer to weigh the advantages and disadvantages, and to come to a conclusion with eyes wide open.
6). Advantages of IP Telephony for the Residential Consumer
As more of us are building our own local area networks at home to connect our family members to each others data and appliances, broadband connections to the outside world have expanded our pipe to the Internet, giving us plenty of bandwidth to consider converging our home network with voice over IP telephony.
7). VoIP Communication Technology
VoIP... or Voice Over Internet Protocol, is the latest and greatest communications technology.
.: Top VOIP Articles
1). VoIP Problems?
Well of course there's VoIP problems, although I think problems is too strong of a word. Instead I would call this VoIP issues. (Just semantics? maybe, read on!)
Some may be old enough to remember making long distance calls where there was static or crackling on the phone line connection. Maybe you remember having to speak LOUDER in order to be heard on the line.
2). How To Set Up A Business VoIP System
To set up a business VoIP system, you need several components. A central device to manage the calls, the way a private branch exchange (PBX) or key system unit (KSU) does in traditional phone systems is one of them.
This can be a dedicated piece of hardware such as an IP PBX, a regular PBX that has been IP-enabled, or a server running specialized software.
3). VoIP Information: Benefits & Drawbacks
Once upon a time, a telephone was just a telephone. You set the base in your home and it featured either a corded or cordless handset for talking to family and friends. Even though that same telephone remains the standard, VoIP, which stands for Voice over Internet Protocol, is increasing in popularity and gradually beginning to change the way that the world sends and receives telephone calls.
4). Skype versus Yahoo
With the influx of complaints regarding Skype’s fall from grace, Danny Wirken measures up the top competitor and internet giant Yahoo!’s news internet telephony service.
Cheaper, faster, better quality, better customer service and a brand you can trust. These are the things Yahoo! want you take away from any of their promotional material for the new Yahoo! voice VoIP service.
5). Voice Over Ip – What Is It And What Are The Choices?
Voice over Internet Protocol. First was the telephone. Alexander Graham Bell had a vision. He saw people communicating over long distances with their own voice, not trough beeps and squeaks. Then came the Internet. A few students and the US military had a vision, somewhat similar to Bell’s. They saw people communicating over long distances, but this time in writing.
6). Why VOIP?
Voice Over Internet Protocol delivers the service of converting the analog line into a digital signal so that voice could be transferred through the internet and this proves to be a lot cheaper than the PSTN (public switched telephone network). Voip is the best for making long distance calls in, inexpensive rates.
Voip and IP telephony are fields which have seen extensive growth and they continue to develop efficiently.
7). Advanced VoIP Gateway Technology
Increased demand for video-based applications in the mobile network drive the deployment of 3G networks. Inherent complexities in traditional video gateways cause performance bottlenecks and inflate costs. If the industry expects to absorb the impending explosion in demand, these proposed cost-saving and complexity-reducing changes are needed.
Unrelenting market demand for video-based applications over mobile networks is driving the increased deployment of 3G networks.