Barbara Tremblay Cipak asked:


If you’re new to computer phone calling, you can get a more detailed explanation of computer to phone service described on the page “Computer Phone Calls”.

Essentially, you have three choices when deciding to utilize this type of service:

1. Calling computer to computer is currently a very common, and in almost all cases, a free way to use a computer phone service. With this type of computer phone service, the person you’re calling must have be signed up with the same computer phone service provider. You use your mouse and keyboard to make and receive these calls. However you can get something called a “softphone” or “USB phone” which allows you to use a regular handset instead of your mouse and keyboard. One of the most popular companies being used today is Skype. For a fee, you can also acquire a phone number to call out or receive calls in, just like a regular phone.

2. IP (Internet Protocol) Phones are Internet phones and operate like a regular phone. Rather than a phone jack into the wall, they have a connecter that connects directly to your router. With an internet phone, you don’t need to physically use the computer to to talk, or dial. All you need is an internet connection and your IP Phone will work.

2(a). WiFi (Wireless Fidelity) IP Phone or WLAN Phones are handsets used for making wireless ‘voice over internet protocol’ (voip) computer calls. They have a built in WiFi transceiver instead of an port. All that is required to make a call is access to the internet via a wireless hookup. Some Cell phone companies are designing their phones with WiFi usage. This means you can either use the standard cell network or make an internet call using the WiFi network (commonly referred to as a WiFi hotspot).

3. An Analog Telephone Adapter (ATA) is another version of computer phone services. With this Adapter you can hook-up a standard phone to your computer or internet connection. Some phone companies are including ATA’s with their normal service packages.

Depending on the method of calling you choose, you may need to download software as well.

For more information on companies offering computer phone services see “Computer Phone Calls”.

Alter Sage asked:


Any global telecoms provider will have experienced an increase in demand for internet access and telephone lines. Today, internet is no longer the slow, dial up and expensive luxury which it used to be. In first world countries, most households have internet access and many businesses are run entirely online. The internet and hosted exchange services has become imperative to the global economy and successful functioning of businesses. Because of the internet and easy connection with distant locations, businesses in separate countries, even continents can converse and trade as if they were located in the same street.

Thanks to the internet, business has been revolutionised, as have communication solutions. The internet has allowed businesses to expand with global branches and a need for frequent over-seas travel to these branches and to serve clients. Business trips require employees to remain in communication with them with reliable tools via calls, emails and faxes for tasks to be completed. In remote areas, this can be difficult to accomplish, especially as some of these areas do not have high quality internet. Using a satellite internet connection can be extremely costly to a business, as is making long distance calls to cellular phones and PSTN lines.



Global Roaming is a part of satellite telecoms options through the use of co-locations services to allow internet connection anywhere on the globe. Carrier services allow clients access to the internet through local voice and data services rather than connecting to the internet via an expensive, distant server. Voice and data services (hosted IP services) use a single interface to select an internet connection via Wi-Fi access points, mobile data networks and bookmarked locations available.

World-wide coverage is created via an ISP working with a space segment, carrier class telecoms network and internet backbone. The sophisticated systems are a reliable alternative to regular fibre networks which do not compromise on connection speed or strength. The systems are fully scalable and can add or subtract users easily without disrupting the connection or existing lines. Global roaming service providers will generally provide a 24 hour-a-day helpline with skilled consultants for any troubleshooting advice necessary.

Communications are extremely sophisticated as they allow for low cost communication which is a reliable and high speed alternative to regular fibre networks.

Emails, faxes, conference calls, Hosted VoIP telephony and internet browsing are now possible from any location globally. Through using co-location services, communication has never been easier. Clients have access to a user friendly interface and select their location to find the local dial up to access their world-wide broadband internet. Global roaming service providers will generally have access points and Wi-Fi hotspots in most global locations.

Business Communication with Global Roaming Solutions

A global telecoms provider should offer specialised Global Roaming as it has become a necessary solution for business communication; eliminating the problems of slow connections, poor quality lines and bad reception.

Through co-location services, a travelling employee is able to remain on their company’s communication network without hassle. Global roaming has an incredibly easy user interface and universal software, eliminating the need for time consuming training.

Hosted VoIP calls can be made cheaply through softphone technology and IP telephony without compromise of quality. Cost reduction is a large benefit of global roaming for business solutions. Due to the use of local broadband access, calls and internet use are charged at local rates instead of the exorbitant costs of internet access through a satellite connection on another continent. Employees are able to communicate with their company and have access to the company network with ease at any time without costing the company a fortune.

Global Roaming solutions are a key factor in allowing a business to function as smoothly and reliably as possible. Overseas travel has become a mandatory role for most businesses and requires that employees stay in contact with the home office. Global roaming solutions have propelled business communication to a much higher level, reducing call costs whilst delivering high quality connections. Client relationships also benefit as employees are always contactable, no matter where their locations is. Employees choosing to work from home can even benefit from Global Roaming as they can remain in contact at all times and connected to the company network.

Business communication has been revolutionised by the use of Global Roaming from a reliable global telecoms provider. The companies performing at their peak and delivering top services to their clients are the companies using global roaming solutions and IP carrier services. Co-location services are setting the standard in business as to which companies can deliver to their clients and which companies cannot.

Michael Talbert asked:


The emerging IEEE 802.16 standard, commonly known as WiMAX, promises to deliver last mile wireless broadband internet access capable of carrying data intensive applications, such as VoIP and streaming video, to Metropolitan Area Networks, as well as sub-urban and rural communities. WiMAX is considered a disruptive technology, designed as an alternative to fixed line DSL and coaxial technologies, and with its 802.16e revision, the cell phone networks as well.

Worldwide Interoperability for Microwave AXcess will operate over licensed and non licensed frequencies using non line of sight (NLOS) and line of sight technologies, extending broadband coverage to cities and towns wirelessly via a metro area network. Additionaly, because of its far reaching capabilities and ease of implementation, wimax is the one technology likey to bridge the Digital Divide, connecting underdeveloped regions and sparsely populated rural areas much more cost effectively than deploying a wireline infrastructure.

WiMAX and WiFi Compared

The widespread adoption of the wireless LAN in the business community, as well as the emergence of WiFi hotspots in public areas, airports, hotels and cafes, has been of tremendous significance in providing mobility to business people and consumers alike. Thanks to the open standards guided by the 802.11 committee and the WiFi Alliance, WiFi technology is becoming ingrained in our society. WiMAX plans to take WiFi a step further.

While the two technologies may sound the same, they are from their conception designed for totally different applications. WiFi is a short range standard that was designed primarily as an extension of the local area network (LAN) to provide mobility for the end user. It operates over unlicensed frequencies and has a range of about 100 meters, depending on obstructions. Typically one access point will be connected to a fixed line network, either a wired LAN or a DSL/cable broadband connection, and the range can be extended by adding more access points at appropriate distances.

WiMAX, on the other hand, is designed to function as a carrier network, or a wireless Internet service provider (WISP), blanketing whole cities and regions with broadband Internet access comparable to DSL. Coverage in optimal conditions could reach 50 kilometers, but in reality are more like 5 km for users with NLOS customer premise equipment (CPE), or up to 15 km with a CPE connected to an external line of sight antenna.

As the older more established technology, the 802.11 WiFi has been used in a mesh topology to cover larger areas such as college campuses and municipalities, for example to connect the terminals in police vehicles to their database. The emerging 802.16 WiMAX will be better suited for larger deployments, and will in fact compliment the private WiFi networks by offering a cheaper and more secure Internet access for data and voice applications.

The WiMAX Standards: Fixed, Nomadic, and Mobile

The 802.16 standard developed by the IEEE envisions a fixed wireless broadband network operating in the spectrum range of 10 GHz to 66 GHz. Originally, only the licensed spectrum was addressed in this range, and line-of-sight multipath technology was dealt with by adopting OFDM as the standard. Subsequent revisions added the 2 GHz to 11 GHz band to the spectrum, and incorporated support for non-line-of-sight technologies and Quality of Service (QoS) techniques, a prerequisite for such time sensitive applications as voice and video.

The revision known as 802.16-2004(d) rolled up all the previous revisions and then added some. Most of these original issues dealt with the Physical and Media Access Control layers, and resulted in a standards list of optional and mandatory elements by which vendors could design their products.

The resulting fixed WiMAX standard has a data rate of up to 40 Mbps, support for half and full duplex transmission, improved QoS, and the incorporation of multiple polling techniques, ultimately reducing packet collisions and overhead.

Base stations are to support several different topologies, such as wireline backhauling, microwave point to point connections, and the ability for the WiMAX base station to backhaul itself by reserving a part of the bandwidth for that purpose.

By design, 802.16d would cater to the residential and small business markets offering wireless broadband access with speeds comparable to DSL. Enterprise markets could be served at T1/E1 data rates.

While this version of WiMax is called fixed, it is in all actuality nomadic. Users on a private WiFi network indoors could be passed off seamlessly to the publicWiMAX network when moving outdoors, their hardware determining the best network available. Devices on the WiMAX data network would include laptops, PDAs, and smart phones equipped with an on board WiMAX capable chip or PC card, utilizing the spectrum for voice, data, video, and music transfers.

Nomadic WiMAX provides for limited mobility in that the range of coverage is handled by the same base station.

WiMAX Goes Mobile

With the adoption of the 802.16e revision in late 2005, all the hype has been on Mobile WiMAX, a technology designed to compete with the cellular networks.

With major support from manufacturers like Intel, Motorola, Siemens, and Nokia among others, mobile WiMAX is built on open standards and is purported to be 4 times faster than the cellular 3G technologies (EVDO, HSDPA). Significant cost savings can be achieved for voice applications by placing calls over the Internet through VoIP.

802.16e provides for fast and seamless handoffs between base stations, with a cell radius of about 3 miles, similar to cellular networks. The standard was ratified in late 2005, and real world applications are beginning to show up in 2007, with more robust development expected throughout 2008.

Because this technology is such a threat to the legacy telecommunications industry, it is no surprise that Sprint Nextel will be deploying WiMAX as opposed to EVDO in its 4G network. Sprint has been buying up much of the WiMAX spectrum, and has recently announced a partnership with Nokia to deploy WiMAX to four Texas cities by mid 2008. This is not their first WiMAX network, and telcos around the globe have been doing the same.

The 802.16 standards are a work in progress, and as such, are subject to changes and revisions. As the standards committee works on the technology, the WiMAX Forum hopes to do what the WiFi Alliance did for the 802.11 standards, by promoting interoperability between components through testing, and offering WiMAX certification to vendors that conform to the 802.16 standards.

It should be noted that many of the WiMAX implementations at the time of this writing are proprietary, and thus do not necessarily follow the recommendations of the IEEE or the WiMAX Forum. The broadband wireless ISP Clearwire Communications has over 200,000 subscribers in 375 cites, and calls its service a WiMAX-class solution, utilizing next-generation, non-line-of-sight wireless technology. Other early adopters of pre-WiMAX technology are forging ahead, providing wireless broadband access to residential consumers and the small business market, with many companies climbing aboard the evolving standards bandwagon to assure interoperability and backwards compatibility of devices and applications.

John B. Mayall asked:


Communication forms an important part of any business today. So, every business is now keeping itself totally equipped with the latest communication tools like the internet, in order to keep in touch with the clients and business associates and to keep abreast of the competition. The internet is used for a variety of purposes such as customer care and technical support by the business organizations.

One great utility of the internet that has now emerged as a great communication tool is the Voice over Internet Protocol or VoIP. Several businesses and even common people are switching over from using the regular telephone to using VoIP for business purposes as well as in homes.

One reason why this transformation is occurring is the cost factor. VoIP has enabled users to make calls to other people at very cheap rates and even for free. It also has a lot of additional features that are not usually available while using the regular telephone. VoIP uses the internet to make and receive calls. The system works by converting the analog audio signals to digital format which gets transmitted on the internet and reconverted at the other end to be heard by the receiver.

There are many features present while using VoIP that is not found with the conventional landline. These include features like answering machine, audio and video conferencing, caller ID, three-way calling, etc. The basic package offered by various VoIP service providers can be utilized free of cost. This goes to say that all you need to do is have a fast internet connection, subscribe with some provider and you are ready to make calls. The other basic infrastructure you need is an internet phone and a computer.

While some providers will themselves be able to provide the internet phone others provide software that enables the computer to be utilized like the telephone.

The advantages to the VoIP system do not end here. If the users at both the ends have subscription with the same service provider, the parties can make and receive calls for free wherever they are. Since the internet is being used for transmission of all the calls, even calls to regular telephones, cell phones, and phone services provided by different VoIP service provider are also quite economical.

If a person has Wi-Fi enabled in his/ her home, they can make use of wireless VoIP that necessitates a Wi-Fi phone. If the person has Wi-Fi connectivity in a broader area, the Wi-Fi phone can be used like a cell phone in the areas where the connectivity is available.

Wi-Fi phones are gaining popularity with people using VoIP for making calls. This is due to the freedom that these phones provide where the person will not need to be located in his / her home to make and receive calls through the VoIP mode. All they will need is to have an active Wi-Fi signal.

So, if you have Wi-Fi connectivity to the internet in the area where you live, you too can opt for a wireless VoIP system. Having such a system will not only enable you to make and receive calls without having to be stationed in one place, it will be cheaper than using your mobile phone for calling.

Wi-Fi is a great technological advance available and VoIP is effectively using this to its benefit to enable users of this system to make and receive calls very easily.

To utilize all features provided, it is best to confer with your other contacts to know which Wi-Fi VoIP service provider they are subscribing with. This will enable you to make and receive calls to your near and dear ones in addition to your business associates and clients totally free of cost. You can make maximum utilization of the services provided as most of your contacts have opted to use the service provider that you have also subscribed with.

Several additional features provided with VoIP system is available to the users free of cost but will cost extra if a regular landline phone is being used. So, if you too want to get these features for free, go in for VoIP.

You will be able to save a lot in your monthly bills if you frequently make overseas calls. VoIP will give you freedom from watching the time elapsed while making long distance calls as these calls through VoIP is quite cheap and you can talk to your hearts content.

Alter Sage asked:


Global roaming services have begun to revolutionise business processes with major increases in Wi-Fi hotspots and 3G global connectivity. Not surprisingly, the use of Wi-Fi and mobile 3G for internet access has grown steadily over the past few years, especially for business users. Increased connectivity means that businesses are no longer disadvantaged by being disconnected when out of the office. With Wi-Fi and 3G technology, employees are able to remain connected to their business at all times, no matter what their location. This ultimately saves money whilst allowing business users access to advanced features of the latest internet technology.

The upsurge of web users switching to global roaming and 3G voice and data gateway services has been an increasing trend in business practice. Smartphones, business travel, multiple branches and home access to work servers have become commonplace in most businesses and require dependable technology for smooth productivity.

Global Roaming for Business

Many companies require employees to travel on international business trips and rely on Wi-Fi hotspots for internet access. VoIP carrier services, advanced user features, smartphone technology and dependable services allow for optimum communication anywhere on the globe, charged at local rates.

The amount of time spent by employees working out of office has also increased, placing a greater demand upon Wi-Fi and 3G mobile technology. VoIP functions are supported by Wi-Fi and 3G, meaning that employees who are away from the office network are still able to access all VoIP features. This includes free calls between VoIP users and reduced calls to other sites, no line rental or heavy maintenance costs, voicemail, email, fax and complete control over call settings. The hosted VoIP telephone solution has helped to revolutionise business processes, allowing for better service production and business productivity.

Growing numbers of Wi-Fi hotspots

According to a study commissioned by a major provider of remote and mobile connectivity devices, the worldwide use of Wi-Fi hotspots has increased by 46% whilst the use of 3G data grew by 59% in 2008. The use of Wi-Fi technology in public locations tripled between 2007 and 2008. Europe overtook the US in terms of Wi-Fi usage. Europe, Asia, the Pacific and Latin America saw steep rises in Wi-Fi use, especially in locations associated with commuting such as hotels, restaurants, airports and train stations. Three quarters of Wi-Fi sessions were recorded as taking place in aeroplanes, hotels and stations and other locations connected to inter-city travel.

3G mobile connectivity

Mobile and laptop users require global roaming services which are economical, user friendly and secure. 3G technology has begun to provide the necessary services and its popularity has grown as a result, especially in the US which experienced the highest increase from 2007 to 2008 which saw the use of 3G for business grow 59%.

Smartphones outwit costly mobile rates

Another important consideration is the introduction and increasing use of smartphones for business and personal use. Handsets like Blackberry and the iPhone rely on 3G technology and Wi-Fi functionality as heavily as laptops do, and with the increase in use of smartphones worldwide, an increase in 3G and Wi-Fi use is inevitable.

iPhone sales sky-rocketed by 123% in the first quarter of 2009 despite the financial difficulties caused by the current recession. The number of people able to make use of 3G technology and carrier services has risen from 35% to 53%. Mobile 3G has increased by 59% from 2007 to 2008 with mobile phones using an average data amount of 211MB per month.

Whilst 3G is popular for smartphones, most have Wi-Fi functionality coupled with Bluetooth technology and 3G.  The increasing occurrence of dual support for 3G cellular networks and Wi-Fi hotspots has the possibility of lowering costs. High mobile tariffs have been prohibitive for customers and Wi-Fi functionality on smartphones has the potential to stall these inflating costs.

Global roaming technology has become indispensable to the workforce, allowing employees to stay connected and communicate with ease. The large growth trends in use of Wi-Fi and 3G for global roaming and massive spike in smartphone sales illustrates that consumer confidence has increased. Web users expect good connectivity for optimum operational performance and according to the increasing levels of 3G and Wi-Fi use; this is an indication that global roaming is widely considered the best option for lower costs, secure access and strong connectivity.

John B. Mayall asked:


Communication forms an important part of any business today. So, every business is now keeping itself totally equipped with the latest communication tools like the internet, in order to keep in touch with the clients and business associates and to keep abreast of the competition. The internet is used for a variety of purposes such as customer care and technical support by the business organizations.

One great utility of the internet that has now emerged as a great communication tool is the Voice over Internet Protocol or VoIP. Several businesses and even common people are switching over from using the regular telephone to using VoIP for business purposes as well as in homes.

One reason why this transformation is occurring is the cost factor. VoIP has enabled users to make calls to other people at very cheap rates and even for free. It also has a lot of additional features that are not usually available while using the regular telephone. VoIP uses the internet to make and receive calls. The system works by converting the analog audio signals to digital format which gets transmitted on the internet and reconverted at the other end to be heard by the receiver.

There are many features present while using VoIP that is not found with the conventional landline. These include features like answering machine, audio and video conferencing, caller ID, three-way calling, etc. The basic package offered by various VoIP service providers can be utilized free of cost. This goes to say that all you need to do is have a fast internet connection, subscribe with some provider and you are ready to make calls. The other basic infrastructure you need is an internet phone and a computer.

While some providers will themselves be able to provide the internet phone others provide software that enables the computer to be utilized like the telephone.

The advantages to the VoIP system do not end here. If the users at both the ends have subscription with the same service provider, the parties can make and receive calls for free wherever they are. Since the internet is being used for transmission of all the calls, even calls to regular telephones, cell phones, and phone services provided by different VoIP service provider are also quite economical.

If a person has Wi-Fi enabled in his/ her home, they can make use of wireless VoIP that necessitates a Wi-Fi phone. If the person has Wi-Fi connectivity in a broader area, the Wi-Fi phone can be used like a cell phone in the areas where the connectivity is available.

Wi-Fi phones are gaining popularity with people using VoIP for making calls. This is due to the freedom that these phones provide where the person will not need to be located in his / her home to make and receive calls through the VoIP mode. All they will need is to have an active Wi-Fi signal.

So, if you have Wi-Fi connectivity to the internet in the area where you live, you too can opt for a wireless VoIP system. Having such a system will not only enable you to make and receive calls without having to be stationed in one place, it will be cheaper than using your mobile phone for calling.

Wi-Fi is a great technological advance available and VoIP is effectively using this to its benefit to enable users of this system to make and receive calls very easily.

To utilize all features provided, it is best to confer with your other contacts to know which Wi-Fi VoIP service provider they are subscribing with. This will enable you to make and receive calls to your near and dear ones in addition to your business associates and clients totally free of cost. You can make maximum utilization of the services provided as most of your contacts have opted to use the service provider that you have also subscribed with.

Several additional features provided with VoIP system is available to the users free of cost but will cost extra if a regular landline phone is being used. So, if you too want to get these features for free, go in for VoIP.

You will be able to save a lot in your monthly bills if you frequently make overseas calls. VoIP will give you freedom from watching the time elapsed while making long distance calls as these calls through VoIP is quite cheap and you can talk to your hearts content.

Michael Talbert asked:


The convergence of data and voice networks in the business environment takes on a new twist with the emergence of wireless networking. The freedom of mobility offered to users in a wireless LAN has proven to provide a noticeable boost in productivity, efficiency, and. employee morale. No longer is the work force tied to their desk when on the job. Workers can access company files and receive important communications from anywhere on the company campus that’s in range of a wireless access point.

With voice communications thrown into the mix, mobile users can stay in touch while roaming the property inside or out, and even on the road. The acceptance of the fixed to mobile convergence concept by the telecommunications industry only promises to fuel the fire for the adoption of VoIP over WiFi.

The Challenges of Implementing VoIP over WiFi Networks

As with any emerging technology, there are challenges to overcome. The development of the converged network, i.e. data and voice on the same IP based LAN, while yet to be an established norm, is proving to be beneficial for businesses from both a cost and productivity perspective. Adding the prospect of VoIP over a wireless network brings up a whole new set of issues.

VoIP is a time sensitive technology. Calls must be set up and authenticated, and voice packets must arrive at their destination without interruption and on time. This requires a near continuous network stream, uninterrupted by less sensitive data transmissions. The implementation of quality of service (QoS) techniques on wired LANs assure that these voice packets receive priority, and call quality issues such as latency, jitter, and packet loss have been sufficiently addressed.

Enter the standards based wireless network, a technology in an earlier stage of development, and more challenges occur. While today’s wired network provides plenty of bandwidth for both voice and data to coexist, WLANs provide less bandwidth, and quality of service issues must be revisited. Security measures such as authentication and encryption must be implemented and can add to the problem by increasing the size of the voice packet. Additionally, users on the move will traverse wireless access points where handoffs must be quick and smooth.

The IEEE 802 standards governing wireless technology are evolving rapidly and promise to deal with a broad spectrum of WiFi issues. Increasing the bandwidth available, prioritizing voice packets for QoS, authentication and encryption protocols for security, and enhanced roaming techniques are all being addressed.

Also in development is the wireless technology commonly known as WiMax, providing for the implementation of high bandwidth wireless communications covering distances of up to 30 miles. The evolution of WiMax could prove of great consequence to developing countries, as well as metropolitan LANs.

Security in a VoIP/WiFi Network

Companies wishing to implement wVoIP must take security issues into consideration from the start. As in any IP network, the dangers of hackers, denial of service, highjacking and spam, all lurk in the shadows.

Because a wireless network uses radio frequencies as its transmission media, the security normally provided by a firewall in a wired network is not sufficient, simply because of the physics. Whereas to break into a wired LAN requires hackers to either physically be inside the network or to hack in through the Internet, in a WLAN they can grab network transmissions from the air while parked across the street. The security issues that network managers must consider in a VoWLAN are the privacy of conversations, and the protection of the network infrastructure.

For WiFi networks, security has had a shaky start with the implementation of WEP as its security mechanism. WEP provides for authentication and encryption between the user and the access point, and was found to be easily hacked. The 802.11i standard, adopted as WPA2 (Wireless Protected Access), provides for more robust security by requiring two way authentication between the user and the network, and uses AES (Advanced Encryption Standard) as its encryption engine.

As network managers plan the rollout of a wireless VoIP network, the greatest security threat they face is improper implementation. Building security into the design of the initial deployment can, and should, affect the network topology, as well as material costs. Failure to do so could lead to further expenses in loss of services and network redesigns in the event of compromise.

WiFi, VoIP, and the Cellular Networks

Manufacturers of cellular devices are incorporating WiFi radios into their handsets at an ever increasing rate. New versions of mobile operating systems are coming out complete with a built in VoIP stack, inviting carriers and manufacturers to add VoIP functionality to their devices. Dual and quad band cell phones can choose between the strongest network available, cellular or WiFi, and place a call accordingly.

As cell phones become more like mobile offices, the benefits of a mobile work force become apparent. In the case of the road warrior, the ability to communicate via email, text messaging, video or voice, allows them to stay on the road longer without losing touch. In the age of instant information, mobile office applications allow files to be downloaded, edited, and uploaded, increasing the productivity of the traveler to the point where just about anything that can be done in the office can be done on the road.

A cell phone that can switch between cellular and WiFi networks can significantly reduce telecommunications costs at the corporate office. With WiFi hotspots popping up at hotels, cafes, and corporate LANs across the globe, mobile workers can stay in touch with office and family both on and off the job. With the addition of a VoIP service provider, cheaper VoIP calls can be made from any WiFi network at the push of a button.

Imagine, if you will, a future where one phone, with one phone number, can seamlessly traverse cellular networks, WiFi networks, cable and PSTN landlines. Where roaming and switching between disparate networks occur without interruption or loss of call quality. Fixed to Mobile Convergence is the buzzword of the decade, and the IP Multimedia Subsystem (IMS) architecture is the mechanism that promises to get us there.

The goal of IMS is to provide all the services and applications that the Internet provides, both current, and as of yet unimagined. IP based services such as VoIP, Push to talk cellular (POC), videoconferencing, text messaging, community services, presence information and file sharing, are just some of the possibilities. Designed to work with any fixed, mobile or wireless packet switched network, backwards compatibility for the legacy circuit switched phone system is provided through the use of gateways.

Although still in its infancy, IMS is already being implemented by AT&T as the platform in its newly acquired Cingular cellular network. Interest in investing in a new infrastructure by mobile and fixed operators has been up and down, as they weigh the costs and benefits of the new technology.

As the technology of VoIP over WiFi networks continues to develop, businesses of all sizes can reap the benefits of increased mobility, productivity, and significant cost savings. Standards committees are constantly working on ways to increase security and quality of service, and as fixed mobile convergence gains acceptance in the telecommunications industry, more choices in the services offered and the IP applications available to businesses are sure to follow. What will also be interesting to watch, is how these very bandwidth intensive applications will be priced by the carrier networks, and how it will affect the neutrality of the Internet.

Erny Setyawati asked:


Using Internet technology is expensive in developing country and poor country. The causes are varieties, beside lack of network infrastructure, expensive hardware and software, although software is developed to open source now days. Based on World Summit Information Society (WSIS) at Jenewa, followed by 150 countries and 12000 degelation world wide, declared that developing country and poor country should get target to be Global Information Society in 20015. The delegation sure, people that know much global information, get achieve Millennium Development Gold (MDG) target easily. Finally, economy improvement will be achieved.

Poor countries that has digital divide problem, quickest way to achieve the target, must find cheap network infrastructure. WIFI or wireless fidelity is solution to implement it. Indonesia, as one of developing country at south east Asia is successful to implement it. We are sure, the infrastructure obstacles are difference between one country and others. We can tell, the benefits to use WIFI,

1.WIFI can be developed without cable and connect building to building, use radio wave with free frequency 2,4 GHZ. WIFI has send and receive capacity until 54Mbps.

2.WIFI network use access point / hot spot, can communicate to all personal computer and laptop, Pentium 3, memory 256 MB. Coaxial cable to use from antenna to server. Wireless client: PCMACIA / PC Card. Gateway, server, modem, router, proxy.

3.The software that run to the WIFI network usually include. Use windows and Linux and web base system.

4.Hot spot can develop at open yard so that people can access Internet freely.

Jenwa asked:


SIP is widely used in voice and video calls made over the internet. SIP is used for video conferencing, streaming multimedia, instant messaging and online games. SIP is used in 3GPP signalling protocol and a permanent feature of the multimedia feature available is most mobile phones and cellular systems.

SIP can be used for conferencing calling and adding or terminating users to the call. SIP, in technical terms, is transport independent and text based so that it can be read by humans so that they can analyse SIP messages.

Now that you have mastered SIP, let’s talk about VoIP. Simply, VoIP means communicating using the internet. Breaking it down, V stands for voice, O for over, I for Internet and P Protocol. Voice over Internet Protocol allows you to implement the transmission of voice over the internet. VoIP can cut the cost of your communications internally within your business and externally with your clients.

WIFI is the trade name for the wireless technology used in home networks, mobile phones, video games and more.

WIFI is supported by nearly every modern PC operating system as well as a lot of advanced game consoles, printers and other types of peripherals.

Together, SIP, VoIP and WIFI create a communication platform that utilises the internet and allows you to communicate more efficiently and cheaply.

SIP, VoIP and WIFI allows you to be lifted from the confines of wired phones and enables you to have 3 way calls, call waiting, transfer calls as well as integrating video conferencing enabling you to get to know your clients and audience better.

Wireless LAN (Wifi Lan) Technology standard 802.11b has the strongest momentum to becoming the main standard for corporate internal wireless LAN networks. The bandwidth of 802.11b is 1 mbits and operates at 2.5 Ghz frequency.

The successor of this current 802.11b standard is 802.11a and it is designed to be faster speed and operate at a different frequency. While 802.11a standard and the technology behind it will be in the ner distant future, 802.11b is here today and many companies and even individuals are deploying and using it now.

Jenwa asked:


SIP is widely used in voice and video calls made over the internet. SIP is used for video conferencing, streaming multimedia, instant messaging and online games. SIP is used in 3GPP signalling protocol and a permanent feature of the multimedia feature available is most mobile phones and cellular systems.

SIP can be used for conferencing calling and adding or terminating users to the call. SIP, in technical terms, is transport independent and text based so that it can be read by humans so that they can analyse SIP messages.

Now that you have mastered SIP, let’s talk about VoIP. Simply, VoIP means communicating using the internet. Breaking it down, V stands for voice, O for over, I for Internet and P Protocol. Voice over Internet Protocol allows you to implement the transmission of voice over the internet. VoIP can cut the cost of your communications internally within your business and externally with your clients.

WIFI is the trade name for the wireless technology used in home networks, mobile phones, video games and more.

WIFI is supported by nearly every modern PC operating system as well as a lot of advanced game consoles, printers and other types of peripherals.

Together, SIP, VoIP and WIFI create a communication platform that utilises the internet and allows you to communicate more efficiently and cheaply.

SIP, VoIP and WIFI allows you to be lifted from the confines of wired phones and enables you to have 3 way calls, call waiting, transfer calls as well as integrating video conferencing enabling you to get to know your clients and audience better.

Wireless LAN (Wifi Lan) Technology standard 802.11b has the strongest momentum to becoming the main standard for corporate internal wireless LAN networks. The bandwidth of 802.11b is 1 mbits and operates at 2.5 Ghz frequency.

The successor of this current 802.11b standard is 802.11a and it is designed to be faster speed and operate at a different frequency. While 802.11a standard and the technology behind it will be in the ner distant future, 802.11b is here today and many companies and even individuals are deploying and using it now.