Voip

Analog VoIP Media Gateways

VoIP Media Gateways come in two flavors: Digital VoIP and Analog VoIP.

With Analog VoIP transmission, electrical signals of different frequency and/or aptitude are transmitted continuously and variably. This is analog VoIP's principle feature. Analog VoIP information is also represented in wave forms.

Advantages of Analog VoIP Media

Advantages of an analog VoIP media approach include simplicity and better coverage than what one may find using a digital VoIP approach. Of note, then, in most environments digital VoIP transmissions would be converted back into an analog signal.

VoIP Media Gateway Modules

High density VoIP media gateway solutions come in module formats. VoIP Media Gateway modules provide integrated media gateway functionality, while delivering high port density in a mezzanine card form.

A standards-based VoIP media gateway module can enable an OEM to bring many VoIP media gateway applications to market faster, with less risk and lower development cost.

VoIP Call Control Modules

Media gateway modules feature, for example, call control protocol functionality – in particular, progress tones and generic tone detection. In addition, VoIP messaging and VoIP security (applied to media streams and signaling) are common supported services.

The MediaPack™ Series Analog VoIP Gateways are cost-effective, cutting-edge technology solutions. These stand-alone analog VoIP Gateway subsystems provide superior voice technology for connecting legacy telephone or fax equipment and PBX systems with IP-based telephony networks, as well as for integration with new IP-based PBX architecture.

The MediaPack Series Analog VoIP Gateways are well-suited for commercial VoIP deployment. Field-proven voice and fax technology and feature-rich design makes the MP series an excellent solution for various emerging VoIP applications. The MediaPack series Analog VoIP Gateways are used in the voice VPN environment, centralized IVR and Quality Monitoring, calling card and pay phone markets. Ideal markets also include MTU (Multi Tenant Units), rural areas and remote analog extensions in a VoIP-based PBX or IP-PBX architecture.

Deliver Feature-Rich Solutions:

The Media Pack Series Analog VolP Gateways are second generation products that have been designed to meet real market needs. In addition to superior voice technology, the products provide advanced telephony features such as long haul, metering, country dependent MWI and CID for true integration with existing telephony infrastructure. The MP Series is based on VolPerfect architecture, AudioCodes' underlying, best-of-breed, core media gateway technology for all of its products.

Part Number Description

AudioCodes MP-104/FXS/AC/SIP-3/N3 MediaPack Analog Media VoIP Gateway - 4 channels - FXS Interface - SIP Gateway

AudioCodes MP-108/FXS/AC/SIP-3/N3 MediaPack Analog Media VoIP Gateway - 8 channels - FXS Interface - SIP Gateway

AudioCodes MP-124/FXS/AC/SIP-3/N3 MediaPack Analog Media VoIP Gateway - 24 channels - FXS Interface - SIP Gateway

AudioCodes MP-104/FXO/AC/SIP-3/N3 MediaPack Analog Media VoIP Gateway - 4 channels - FXO Interface - SIP Gateway

AudioCodes MP-108/FXO/AC/SIP-3/N3 MediaPack Analog Media VoIP Gateway - 8 channels - FXO Interface - SIP Gateway

AudioCodes MP-104/FXS/AC/H323-3/N3 MediaPack Analog Media VoIP Gateway - 4 channels - FXS Interface - H.323 Gateway

AudioCodes MP-108/FXS/AC/H323-3/N3 MediaPack Analog Media VoIP Gateway - 8 channels - FXS Interface - H.323 Gateway

AudioCodes MP-124/FXS/AC/H323-3/N3 MediaPack Analog Media VoIP Gateway - 24 channels - FXS Interface - H.323 Gateway

AudioCodes MP-104/FXO/AC/H323-3/N3 MediaPack Analog Media VoIP Gateway - 4 channels - FXO Interface - H.323 Gateway

AudioCodes MP-108/FXO/AC/H323-3/N3 MediaPack Analog Media VoIP Gateway - 8 channels - FXO Interface - H.323 Gateway

Audiocodes product family is based on AudioCode's' field-proven carrier class and best-of-breed VoIP technology. Featuring 2, 4, 8 or 24 analog ports, the gateways connect analog terminals, PBXs or key systems to the IP network using FXO or FXS connectivity.

Compliant with multiple protocols including SIP, H.323, MGCP and MEGACO, the Analog Media Gateways enable flexible deployment and interoperability for the evolving next generation networks. Using AudioCodes' Analog Media Gateways, Network Equipment Providers and System Integrators can effectively deliver carrier-hosted converged services as well as enterprise-based applications.

The MediaPack™ Analog Media Gateway product family is based on AudioCodes' field-proven and best-of-breed VoIP technology. Featuring 2, 4, 8 or 24 analog ports, the gateways connect analog terminals, PBXs or key systems to the IP network using FXO or FXS connectivity. Compliant with multiple protocols including SIP, H.323 and MGCP, the Analog Media Gateways enable flexible deployment and interoperability for the evolving next generation networks. Using AudioCodes' Analog Media Gateways, Network Equipment Providers and System Integrators can effectively deliver carrier-hosted converged services as well as enterprise-based applications.

Tags : Analog Voip,Analog Voip Media, Analog VOIP media Gateways , VOIP Analog Media, Gateways Voip, Media gateways

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Advantages of VoIP

Advantages of VoIP : What are the advantages to VoIP?

Let’s run down a brief overview of the principal VOIP advantages

VoIP has lots of advantages over a regular phone service.

One of the main advantages of VoIP is the low cost. If you have a fast Internet connection (DSL or cable) you can make PC-to-PC phone calls anywhere in the world for free. If you wish to make a PC-to-phone connection, however, there's usually a charge for this but probably much cheaper than your regular phone service.

You pick up the receiver, which sends a signal to the ATA.

The phone number data is sent in the form of a request to your VoIP company's call processor. The call processor checks it to ensure that it's in a valid format.

You finish talking and hang up the receiver.

When you hang up, the circuit is closed between your phone and the ATA.

The ATA sends a signal to the soft switch connecting the call, terminating the session.

You can also sign up with a VoIP service provider which charges a monthly fee in return for unlimited calls within a certain geographic area. For example, some VoIP services in the United States allow you to call anywhere in North America at no extra charge. Overseas calls are charged at a relatively small rate.

Another advantage of VoIP is portability. You can make and receive phone calls wherever there is a broadband connection simply by signing in to your VoIP account. This makes VoIP as convenient as e-mail – if you are travelling, simply pack a headset or Internet phone and you can talk to your family or business associates for almost nothing.

When you are using a PSTN line, you are charged for the time you are connected to that carriers network. The longer you stay connected, the more that you pay. With VoIP you are using either a public or private network and thus do not have any time related call charges. In addition, VoIP can be used to connect more than two people for a call, allowing you to talk to many people at the same time.

An international phone. A VoIP phone does not have country boundaries. You can take it with you wherever you go. And the same rates apply regardless of where you are when you use it.

There are many other features that make VoIP attractive. Call forwarding, call waiting, voicemail, caller ID and three-way calling are some of the many services included with Internet telephone at no extra charge. You can also send data such as pictures and documents at the same time you are talking on the phone.

3-way calling, call forwarding, callback services and caller ID are usually standard features (free) with VoIP companies. Those are normally charged extra for, by the traditional telecommunication companies (telcos) .

Huge Savings

Imagine being able to keep your current phone number and make as many long distance calls as you wish (within a certain area) for one low price. No more fluctuating phone bills, outrageous long distance charges, or other surcharges that repeatedly shows up on your bill. Voice over IP offers just that. Just as email changed how people communicate, so too will VoIP.

Disadvantages of VoIP

With all this going for it, it's a wonder that anybody still uses regular phone services. However, there are a few disadvantages to VoIP. Continuous service during a power outage and emergency calls are two of the biggest problems.

The disadvantages of VOIP can be annoying, but are relatively limited for the consumer. The main complaints regarding VOIP have to do with providing the level of quality of service that customers are accustomed to with regular telephone technology.

First of all, VoIP is dependant on wall power. Your current phone runs on phantom power that is provided over the line from the central office. Even if your power goes out, your phone (unless it is a cordless) still works. With VoIP, no power means no phone. A stable power source must be created for VoIP.

Because VoIP uses an Internet connection, it's susceptible to all the hiccups normally associated with home broadband services. All of these factors affect call quality:

Latency

Jitter

Packet loss

Phone conversations can become distorted, garbled or lost because of transmission errors. Some kind of stability in Internet data transfer needs to be guaranteed before VoIP could truly replace traditional phones

VoIP is susceptible to worms, viruses and hacking, although this is very rare and VoIP developers are working on VoIP encryption to counter this.

During a blackout a regular phone is kept in service by the current supplied through the phone line. This is not possible with Internet phones, so when the power goes out, there is no VoIP phone service. One solution to this problem is to use battery backups or power generators to provide electricity.

Given the growth and increasing popularity of VoIP, it seems that all these disadvantages will be overcome in time. Now is the time that the major service providers – isp’s and telcoms – are using their formidable resources to work through the VoIP bugs. It is estimated that as soon as 2007 most of the kinks will be ironed out and VoIP should receive widespread consumer acceptance.

All these voip disadvantages will be overcome in time. There is a tremendous amount of work being done to increase the reliability and usefulness of VoIP. By 2007 most of the kinks will be worked out and VoIP will receive widespread consumer acceptance.

Overall, the disadvantages of VOIP aren't significant enough to dissuade the average consumer from using the technology; especially with the fact that they know that the calls they are making are free. But we can rest assured that the technology will only get more reliable as time goes by.

The disadvantages of VOIP are usually tolerable if the callers are using a free service and the calls are for individual, personal communication. But once a network of users, such as a business, wants to use VOIP, the problems become a little more complicated. Part of the reason is that most networks have a firewall; and most firewalls don't know how to route a VOIP call once it is received - which phone does it go to?

Lack of emergency reliability and clarity are also two of the major disadvantages. Sometimes echo is heard on the phone so it becomes difficult for us to understand what we are speaking and for the front person as to what are we saying.

There are a few disadvantages to VoIP. Some of these are being addressed by ISPs and VoIP providers, while others are likely to remain.

Tags : Advantages of VoIP , What are the advantages to VoIP? , Voip Advantages

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UNIVERSE ON VOIP Universe Telecom’s IP PBX is a completely integrated unified communications platform for businesses looking to stay ahead of the technology curve. We offer comprehensive VoIP business phone system solutions.

Universe Telecom phone systems were specifically designed for the needs of small businesses and branch offices having from 10 to 100 employees.

Universe Telecom VoIP phone system features are delivered on a singe server – which make our systems easy to install, use, and manage. More importantly, it provides your business with most complete and cost effective IP phone system available.

Tags : UNIVERSE ON VOIP , UNIVERSE of VOIP , voip universe, universe means voip

Small Business Voip

Small Business VoIP

Small companies are increasingly choosing Voice over Internet Protocol (VoIP) hosted business phone packages, like Packet8 Virtual Office, instead of conventional telephone systems. VoIP can mean a lot more than just savings to a small business. The greater versatility of hosted VoIP system allows each business to tailor a telecommunications package, regardless of geography, specifically to meet its needs without spending heavily on equipment, installation, maintenance or an IT staff.

Packet8 Virtual Office is an affordable, robust and easy-to-manage phone solution with all the premium PBX features and functionality of a traditional telecom system. All that's needed is a broadband connection and Packet8 VoIP phone service to create a low cost, high feature, professional telephone system for companies with as few as three employees in the same office, region or spread across the globe.

With over 20 years of telecommunications experience and more than 68 multimedia and VoIP technology patents, Packet8 is regarded as one of the VoIP industry's most respected and admired service providers.

Increasing Business Value with VoIP
Businesses are in a constant struggle to control overhead. VoIP, along with the IP telephony capabilities it enables, is a technology that offers small- and medium-sized businesses a range of solutions that can lower telecommunications costs and, in many cases, enhance productivity. Additionally, using VoIP will allow these businesses to take advantage of future application development.

There are reliable retail VoIP services, multi-line business products, VoIP PBX systems, as well as fax services. Packages as low as USD 24 per month to unlimited calling internationally to Canada, Europe, and other countries are some of the many advantages of VoIP services. 1888voipservices brings online holistic VoiP services; providers, software, hardware, accessories and more at the most competitive rates. VoIP uses the power of the internet to bring reliable and affordable phone services worldwide.

Small Business VoIP Options
VoIP (Voice over Internet Protocol) represents the latest in phone system technology. With it, regular voice calls are sent over a computer network instead of traditional phone lines. There are two main types of VoIP to consider.

Small business VoIP systems
Small business VoIP dealers replace your existing phone system with new hardware. Instead of using separate phone lines, calls are sent over your internal network. While these systems offer many potential benefits, they're not a guaranteed way to save money.

Small business VoIP service
A small business VoIP system will not reduce charges for calls outside the company network, though. To do that, you should turn instead to small business VoIP service. With VoIP service, your calls are sent over the Internet as data until they near their destination, then converted back and transmitted on regular phone lines.

Small Business VoIP Solutions
Voice over IP (VoIP) systems are the answer to reliable, cost effective small business voice and fax communications needs. There has never been a higher quality, lower priced technology for intra-office and external voice and fax communications until now. You will be astonished at the savings you receive on your local and long distance telephone calls. You will be impressed by the stability and superior quality provided by Velocity Networks VoIP solutions, geared to the specific needs of small business customers. You will never need another telephone or Internet service provider again with the Velocity Network full lineup of feature-rich communications solutions.

Small Business VoIP provides an array of convenient features that allow access to all stored information from any location using an easy to use web-based management system.

Small Business VoIP Solutions:
Work with broadband technology
Completely replace your need for a separate business telephone provider
Can be integrated with your current internet solution
Are offered at a flat rate monthly cost

Tags : Small Business VoIP Solutions

Disclaimer: On this page, we have tried to list all the major information on Small Business VoIP Solutions. We have tried our best to provide accurate and updated details about Small Business VoIP Solutions. However, if you encounter any discrepancy, do write to us. We welcome any kind of feedback that would improve the quality of the site, a site that strives to provide the best information on Small Business VoIP Solutions.

voip software

VOIP Software

Voice over IP (VoIP) software is used to conduct telephone-like voice conversations across IP based networks. For residential markets, VOIP phone service is often cheaper than traditional PSTN phone service and can remove geographic restrictions to telephone numbers (i.e. have a "New York" PSTN phone number in Tokyo).

VoIP is a cost effective solution to your telephony needs. It allows you to make cheap calls to anyone, anywhere in the world using your PC or a VoIP Phone handset. What's more, calls between VoIP lines are free. To confirm which VoIP SIP software will meet your needs, we strongly recommend you just download and try it. You don't have to purchase to download and our software's small file size means it only take a couple of seconds to download and install.

VoIP Software : Skype
Cost: Free

Skype is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA. The Skype Group is headquartered in Luxembourg with offices also in London and Tallinn.

VoIP Software : Google Talk
Cost: Free

Google Talk is a service developed by Google for instant messaging (IM) that also allows for PC to PC audio conversations. Google Talk beta was released on August 24, 2005 and consists of both a service and a client used to connect to the service. Unlike some other instant messaging services, Google Talk uses an open protocol (Jabber) for the IM part and it encourages the use of clients other than their own in connecting to the Google Talk service.

cisco voip Cisco Systems , Cisco VoIP

University dumps Cisco VoIP for open-source Asterisk

The south Texas school is boldly moving thousands of users off a Cisco VoIP platform to an open-source VoIP network based on Asterisk.

Cisco Systems, Inc. is the worldwide leader in networking for the Internet. Cisco IP telephony products are a key component of the Cisco Unified Communications system, which delivers the business benefits of a converged network to organizations of all sizes. Cisco IP telephony products support a wide breadth of Session Initiation Protocol (SIP) capabilities. This network provides a secure foundation optimized for data, wireless, and IP Communications, and includes the ability to support IP-to-IP gateways for easy and cost-effective connectivity between independent voice-over-IP (VoIP) networks and analog phone gateways using your existing phone equipment.

Cisco VoIP Products: Cisco CP-7906G, Cisco CP-7914, Cisco CP-7936, Cisco CP-7936-PWR-KIT, Cisco CP-7940G, Cisco CP-7940G Open Box, Cisco CP-7941G, Cisco CP-7941G Open Box, Cisco CP-7960G, Cisco CP-7960G Refurb, Cisco CP-7961G, Cisco CP-7970G, Cisco CP-DOUBLEFOOTSTAND, Cisco CP-PWR-CUBE, Cisco CP-PWR-CUBE2, Cisco CP-PWR-CUBE3, Cisco CP-PWR-CUBE3 10Pack, Cisco CP-SINGLEFOOTSTAND,

Do you use a Cisco VoIP solution?

Cisco VoIP Telephony Solution
Product Description:
The Cisco VoIP system is composed of Cisco IP phones, a Cisco Call Manager, a Cisco Unity voicemail server and a Cisco voice gateway router to connect the VoIP system to the public switched telephone network (PSTN). The goal of the VoIP system is to provide telephony services over an IP network which is also used to interconnect the distinct elements of the VoIP system.

CISCO VOIP GATEWAY AND ACCESS SERVERS

The Cisco VOIP Gateway converts TDM traffic from the Public Switched Telephone Network (PSTN) into either H.323- or Session Initiation Protocol (SIP)-based VoIP traffic. Gateways are considered intelligent endpoints, and can provide billing, alarming, built-in interactive voice response (IVR), routing, digit manipulation, and security.

Manufacturer/Vendor/Distributor: Cisco Systems, Inc.
Level 1,
18 & 20 Brindabella Circuit
Canberra International Airport ACT 2609
Contact:Tony Hall
Federal Security Policy Systems Engineer
Sales / Channels
Phone: +61 2 6216 0647
Mobile: +61 401 890 577
Fax: +61 2 6247 3422
Email: anthhall@cisco.com
Web: www.cisco.com

CyberTech Launches Gateway Selective Recording for Cisco VoIP

CyberTech International, a global provider of advanced voice and data recording technologies, has announced Gateway Selective Recording for Cisco VoIP networks.

Tags : Cisco Systems , Cisco VoIP , Cisco VoIP Gateways , cisco voip certification , cisco voip qos , cisco voip solution , cisco voip configuration , Cisco VoIP Telephony Solution , Cisco VoIP PBX

VoIP Tariff MTNL Cuts VoIP Tariffs, Most Destinations Rs 1.00 per Minute.

India's State-run telecommunication company, MTNL slashed international call rates to Rupees one per minute (US 2.6 cents) for its Voice Over Internet Protocol (VoIP) customers. This rate covers call rates to about 100 countries such as Saudi Arabia, Pakistan, Japan, Malaysia and Kuwait. Call rates to US, UK, Canada, Australia, Singapore and Hong Kong are already stand at Rs one minute.

wireless VoIP The Hardware Zone has reviewed the new Jabra GN9350, a dual function wireless headset which combines both landline and VoIP in a single package with very good wireless range.
The GN9350 main features include the ability to be linked to a PC for VoIP connections while also connected to the landline for your normal phone calls. Switching between the PC audio and the telephone line is as simple as pressing a button on the base station or the headset (though the headset only allows you to switch to the telephone line and not back).

Transitions between the telephone line and PC audio were smooth with only a slight pause between switches. The Jabra headset also provides connectivity for Digital Enhanced Cordless Telecommunication (DECT) phones which must be paired to the base station. Another function that is advertised but which we were unable to test since we were only provided with one headset, is the conference call function. The GN9350 allows up to 4 headsets to be set up in conference mode for conference calls. The GN9350 also boasts of a wireless range of up to 300ft (91.4m). Walls may restrict the signal somewhat but testing done around the office gave a decent range from which to roam about.

VoIP systems "InfoWorld tests upwards of 200 IT products every year, and we see many, many good ones," said Doug Dineley, InfoWorld's Test Center executive editor. "Our Technology of the Year award winners represent not only the cream of the crop, but the best products in the most important product categories. From the top AJAX development tools and SOA middleware to the best blade servers and VoIP systems, these are the products at the leading edge of IT."
Mark Spencer, creator of Asterisk and Digium's chief technology officer, commented: "The InfoWorld Technology of the Year 2008 award is an enormous acknowledgement of the work and success of the worldwide Asterisk community. Asterisk wouldn't be in a position to rival some of the biggest vendors of proprietary voice technology today if it weren't for the inherent strength of open source and dedication of the community of developers."

iPhone VoIP GoIP International launches an iPhone VoIP in a Box platform with highly advanced VoIP services, as a complete private label solution As the iPhone is expected to be sold in 70 countries before New Year, GoIP International has during the past many months created an amazing VoIP product for the growing iPhone success. Estimated market is currently over 10 million iPhone 2G and 3G users, which is expected to grow to up towards 45 million users at end of 2009 according to analyst PiperJaffray. Currently Apple produces 800.000 new iPhone devices weekly.
The iPhone has already revolutionized the way we use mobile communication. GoIP International sees a great growth potential for service providers to offer their own complete iPhone VoIP service as an add-on to their existing telecommunication portfolio, or needs a stand-alone solution to enter into the new wave of advanced communication services.
GoIP’s iPhone “VoIP in a Box” platform enables Telecom Service Providers to offer a set of unique VoIP services to iPhone users. The unique services includes, free calling between iPhone users, VoIP calls via Wi-Fi, location based service access, utilizing the built in GPS, using existing mobile number as caller ID on outbound VoIP calls, auto top-up of account, controlling multiple rate plans, multilingual front- & backend system.

VoIP SP1 Although no one knew it is broken, Microsoft is fixing it. I think it's policy of first release then fix attitude from other solutions has been carried over to VoIP solutions as well. But don't worry, it is not entire VoIP they are fixing, it a feature update to its Response Point VoIP phone system for small businesses. Yes I also had to say phew!.

Microsoft has announced plans to release a feature update to its Response Point VoIP phone system for small businesses as a Service Pack. The SP 1 will be available this summer as a free download.

Response Point SP1 will help small businesses move from analog phone service to VoIP without the need for technical expertise. The upgraded solution features a VoIP account setup wizard in the Response Point Administrator for quick and easy scalability. It also allows businesses to select a local phone number for use in remote locations.

VoIP Blocking As VoIP business users in countries like Dubai are being blocked. Many users are turning to VPN solutions to allow the ability to use VoIP and get around the current blocking issue. This however is an expensive and unnecessary solution as SpeedVoip Technology able to resolve this issue. SpeedVoIP has released a betyter solution for Voip Blocking called VGCP (VoiceGuard Control Protocol) .

1. Overview

Yahoo messenger, Skype, Microsoft Messenger and Vonage offer a subscriber the ability to "call" someone using Softphone/Gateway ATA/IPPhone/IAD. However, several ISPs are blocking or degrading this service in order to force a consumer to use a ISP sponsored service. States such as the UAE block this technology outright while US corporations, such as Clearwire, claim that they might degrade the quality of competing services by adding choppy and delayed services.
SpeedVoIP is a leader in circumventing VoIP blocking imposed by ISP or Telco. For vision of Net Neutrality, VoiceGuard @ is created to address a growing number of ISPs who either degrade or block voice services over their networks. VoiceGuard @ gives choice back to the subscribers or customers of ITSP.

2. Technology

VGCP(Voice Guard Control Protocol)
VGCP is a proprietary layer 2 link protocol working at between IP stack and nic driver for VoIP anti-blocking. The core patent-pending VGCP is industry’s most state-of-the-art voice service provider class security protocol whose scalability and flexibility results in not to compromise voice quality and overhead. VGCP controls and monitors full voice signaling and media flow intelligently, meanwhile disguises sip and rtp packets into normal allowed data packets such as DNS and TFTP, and makes two-way encryption and decryption driven by user-customized policy. VGCP is fully transparent to upper SIP proxy or UA which means VoiceGuard can work with any 3rd-party Softphone/ATA/Gateway/IPPhone/IADs and SIP proxy or server not like some competitors which take effect on their own device and softswitch.

SidePass
Due to unique architecture, when deploying VoiceGuard Border Controller(VGBC) at customer CPE side, VGBC can work in the way similar to that of soho router, but it only encrypts and decrypts SIP and RTP packets on link layer, not to handup these packets to IP stack for forwarding while bypassing other data packets originating from SIP terminals. In this scenario, peak throughput and minimal CPU overhead can be easily achieved.

TrafficDisturb
Current leading carrier-class VoIP blocking platform such as NarusInsight can detect VoIP traffic with a special algorithm“traffic classification in the dark” which filters VoIP traffic based on behavioral-signature model. Compared with previous one of payload-signature model, NarusInsight is more sophisticated and robust. After deep study into traffic behavior of SIP UA, Proxy and Registrar, VoiceGuard can real-time incorporate light-weight traffic for puzzling and bypassing VoIP blocking system without consuming more bandwidth and compromising voice quality. Even in some circumstance, VoiceGuard can simulate traffic behavior of universal data networking protocol such as OICQ, MSN and so on.

3. Key Features

Maximum call completion rate and maximum voice service duration
SIP core standards and a variety of drafts supported
Proprietary link layer protocol for controlling
Any 3rd-party Softphone/ATA/Gateway/IPPhone/IAD and SIP Proxy/Registrar/SBC supported
The most comprehensive codec including g.711/g.723/g.729ab/iLBC/gsm/speechX supported
Bypassing Narus and Verso platform detection
Flexible user-customized encryption policy driven
Strict call path protection and security up to termination
Only simultaneous signaling/media/T.38 fax packet support across any firewall.
No network or firewall modification is required.
Excellent voice quality without any latency and performance compromise
Small footprint terminal SDK .
Available on all major platforms.

VoIP Backup I read about backup for VoIP on a leading Magazine today. One of the backups it suggest is that to keep the good old copper wires, PSTN, and that is what I am doing, at office, home office and home.
They also suggested and I also have UPS backups fro my routers, DSL routers and VoIP switches.
Our Asterisk Servers are protected and our VoIP Phones, a mixture of Cisco, Linksys, Astra, Avaya and Grandstream phones also protected by UPS, over POE.
I even have a Solar Power system at Home and home office. System runs well with most of the time sending excess power to the grid.
But with all these systems, I have lost VoIP service, in two incidents when we lost power in the area, we lost our phone service. But our office and home was well lit.
Why? because the central switch (Belong to service provider) that our DSL service came from also lost power. So only service we had was good old POTS service, and our cell phones, iPhones.
I do not have cable service but I am not sure if they also connect to central switches. And if they do, it will be the same picture, your area loose power, you get no VoIP.
So make sure that you have at least one pots line with a old type phone and well charged cell phone.

VoIP weaknesses VoIP weaknesses
As the saying goes, there's no such thing as a free lunch. While the savings offered by VoIP services make them very attractive, there are some other factors that need to be considered before jumping aboard.

The first is call quality. Because VoIP calls travel over the Internet rather than the telephone network, they have to compete with a lot of other traffic. The performance of computer networks is affected by the amount of data travelling over them, so when things are busy, delivery delays can occur. Sometimes data packets can get lost altogether as they try to find their way to their destination.

For VoIP calls, such delays and losses cause drops in call quality. Words might sound clipped or the connection may drop out for fraction of a second. In worst cases, calls are all but unintelligible. However, many of the major VoIP service providers are working to interconnect their own networks. This will help to keep call traffic away from the public Internet and so improve call quality.

You'll also need a decent broadband connection. Many VoIP providers recommend using nothing slower than a 512 kbps download/128kbps upload link. Anything below this can have an adverse effect on call quality.

Also, because you need a broadband connection to make and receive calls, you also need power. If there is a blackout, you'll lose your service. The traditional phone network has been designed to operate without main power, but this isn't the case with a VoIP service. Mind you, this power limitation also applies to cordless landlines that are popular in many Australian households.

It's also worth remembering that VoIP calls are treated like any other type of broadband usage by your ISP. Calculations vary, but as a rough guide, each 10 minutes of talking will eat up 1MB of your download quota. Anyone with a small monthly cap will need to pay close attention to their usage.

VoIP and Cable Companies VoIP and Cable Companies
If anyone is in a position to win the Telecommunication wars, it's the cable companies. Massive consolidation in the cable industry has led to huge privately owned networks that in many cases make it unnecessary to route calls over the public Internet. Quality of Service issues can be handled in house, and after all, companies like Cisco Systems pretty much built the Internet and are largely responsible for the development of Voice over IP Telephony.

Cable companies as VoIP service providers have the ability to bundle voice with high speed data and digital cable TV, and are even now running introductory offers of all three for 99.00 a month in some markets. But be careful, introductory offers end and VoIP plans with the cable companies are some of the most expensive to be had.

While VoIP service providers like Comcast and Time Warner generally receive good reviews for sound quality, monthly calling plans cost $40.00 and $45.00 respectively. Not bad when looking at a $70.00 phone bill from Bell South, but over twice as much as a pure-play VoIP service provider. No doubt, a good reliable broadband connection through a cable modem is the ideal VoIP solution (wireless notwithstanding), but you don't have to use your cable company for VoIP.

VoIP numbering system VoIP numbering system
While the prospect of being able to take your phone number with you when you travel is attractive, this feature of VoIP also raises some challenges. For example, emergency services rely on what's called the Integrated Public Number Database (IPND) to locate callers based on their phone number. If that number no longer relates to a physical location, emergency calls can be compromised.

With this in mind, the Australian Communications and Media Authority (ACMA) has introduced a new location-independent numbering range and is encouraging VoIP service providers to use it. Under the system, any numbers that don't relate to a particular physical location will start with the prefix 0550. This will alert both emergency services and other callers to the fact that they are calling or being called from a VoIP service.

The system is currently voluntary for VoIP providers, however ACMA says it will be monitoring usage closely to ensure compliance.

Peer to Peer VoIP

Peer to Peer VoIP

The least expensive VoIP solution would be using a computer on a peer to peer network. Offered from such VoIP service providers as Skype or the Gizmo Project, the software is free to download and calls within the network are free worldwide. Calls to PSTN numbers are charged at a low VoIP rate, and in the case of Skype, at a low yearly rate. Peer to Peer VoIP is a software solution, meaning that no ATA is required, and your phone is a pair of earplugs and a microphone plugged into your computer. The downside is that call quality is lacking compared to some of the hardware VoIP solutions available.

Establishing a Peer-to-Peer VoIP Call

A peer-to-peer VoIP call occurs when two VoIP phones communicate directly over IP without IP PBXs between them. A peer-to-peer call can be initiated directly, by calling a phone’s SIP URI, or indirectly by dialing a phone number. A peer-to-peer call will only be established when a phone number is dialed if both phones share an IP PBX. For an audio call, there is no difference (in end user experience) between a peer-to-peer call and one that uses an IP PBX.

However, peer-to-peer calls become important if callers use features like push-to-talk, video, and mesh-based audio conferencing. The VoIP versions of these features cannot be transmitted over PSTN. The features can only be used in peer-to-peer VoIP calls.

VoIP has been called a few different things in its colourful past such as internet telephony, peer-to-peer, P2P, IP telephony, broadband telephony, voice over broadband and many, many other names. At Skype we much prefer using the simpler term free calls over the internet than the geeky VoIP.

Another Skype competitor

Here is another competitor to Skype in the peer to peer VoIP world -- called Peerio it appears to have a number of advantages over Skype... with a few caveats though.

An Experimental Study of the Skype Peer-to-Peer VoIP System

Skype's peer-to-peer overlay, and the network workload generated by Skype users. Third, we provide data on user-behavior that can be used for future design and modeling of peer-to-peer VoIP networks; note that developing an explicit quantitative model is out of scope of the present paper. Altogether, we find evidence that Skype is fundamentally different from the peer-to-peer networks studied in the past.Supernode-based peer-to-peer networks organize participants into two layers: supernodes, and ordinary nodes. Such networks have been the subject of recent research in [29, 28, 6, 5]. Typically, supernodes maintain an overlay network among themselves, while ordinary nodes pick one (or a small number of) supernodes to associate with; supernodes also function as ordinary nodes and are elected from amongst them based on some criteria. Ordinary nodes issue queries through the supernode(s) they are associated with.Many peer-to-peer networks handle churn by dynamically restructuring the network through periodic or reactive maintenance traffic. Churn has been studied extensively in peer-to-peer file-sharing networks [26, 27, 2, 13, 7]; the consensus is that churn can be high.

Future Work
We have only scratched the surface of understanding how peer-to-peer supports VoIP. More generally, interactive applications such as peer-to-peer web-caching, VoIP, instant messaging, games etc. may demonstrate different characteristics than P2P file-sharing networks and we are interested in understanding these differences. Measuring existing interactive networks including instant messaging networks (AIM, MSN, Yahoo!) and massively multiplayer game networks (World of Warcraft, Ultima Online) can reveal different user behavior. In addition, it would be useful to compare user experience, call setup latency and call quality in Skype and other infrastructure-based telephony services including traditional telephone and cellular networks, and VoIP networks that use SIP and H.323 for signaling. Combined, these would give insights about how peer-to-peer networks for such applications should be built and provisioned.

Overall, we present measurement data useful for designing and modeling a peer-to-peer VoIP system. Even though this data is limited due to the proprietary nature of Skype, we believe that this study could server as a basis for further understanding and discussing the differences between peer-to-peer file-sharing and peer-to-peer VoIP systems.

VoIP Technology for SIP Peer-To-Peer :

Fusion believes its new "efonica" branded softphone and uniquely configured VoIP network will provide significant advantages over most VoIP peer-to-peer networks. Fusion's technology eliminates the method of routing utilized by many VoIP peer-to-peer networks, in which many users' Internet bandwidth and/or PCs are utilized as part of the carrier's larger network to set up calls for thousands of other users. DSP technology for peer-to-peer Internet calls is one of several differentiators behind Fusion's new VoIP offering, expected to be launched worldwide this quarter", remarked Matthew Rosen, Fusion's President and CEO.

Comments ::::::::::::::

I saw a demo of another enterprise peer-to-peer system in UK recently- from a Canadian company called Nimcat Networks. Awesome. They are backed by some big players. I think peer-to-peer is the future of business VoIP.

Reasons for Choosing VOIP Voice over IP (VoIP) was developed in order to provide access to voice communication in any place around the world. In most places, voice communication is quite costly. Consider making a phone call to a person living in a country half the globe away. The first thing you think of in this case is your phone bill! VoIP solves this problem and many others.

There are of course a few drawbacks attached to the use of VoIP, as is the case with any new technology, but the advantages largely outbalance these. Let's explore below the benefits of VoIP and see how it can improve your home or business voice communication.

If you don’t use VoIP for voice communication, then you are most certainly using the good old phone line (PSTN – Packet-Switched Telephone Network). On a PSTN line, time is really money. You actually pay for each minute you spend communicating on the phone. International calls are much more expensive. Since VoIP uses the Internet as backbone, the only cost you have when using it is the monthly Internet bill to your ISP. Of course you need broadband Internet access, like ADSL, with a decent speed. In fact, unlimited 24/7 ADSL Internet service is what most people use today, and this causes your monthly cost to be of a fixed amount. You can speak as much as you wish on VoIP and the connection cost will still be the same.
Studies have shown that, compared to using a PSTN line, using VoIP can potentially make you save up to 40 % on local calls, and up to 90 % on international calls.

More than two persons
On the phone line, only two persons can speak at a time. With VoIP, you can setup a conference with a whole team communicating in real time. VoIP compresses data packets during transmission, and this causes more data to be handled over the carrier. As a result, more calls can be handled on one access line.

Cheap user hardware and software
If you are an Internet user wishing to use VoIP for voice communication, the only additional hardware you require besides your computer and Internet connection are a sound card, speakers and a microphone. These are quite cheap. There exist several software packages downloadable from the Internet, which you can install and use for the purpose. Examples of such applications are the well-known Skype and Net2Phone. You do not actually need a telephone set, which can be quite expensive, along with the underlying equipment, especially when you have a phone network.

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