Voice over Internet Protocol, or commonly known as VoIP, was first introduced in the North America and European countries and proved to be a "hot item" in the modern communication industry. In addition, the popularity of VoIP system increased further when VoIP system providers introduced the mass-market VoIP services, which allows VoIP subscribers to make and receive voice calls over the traditional PSTN or public switched telephone networks. It resulted to cheaper system maintenance and low monthly subscriptions. In addition, most VoIP system providers are offering unlimited voice calls within domestic applications (areas within the United States, for instance) as well to some other parts of the world, particularly in Canada and selected European and Asian countries for a fixed monthly fee.

If you will take a look on the VoIP's continuous saga on the modern communication industry, you will notice that the main reason for such huge popularity of the system is the cheaper maintenance cost and mobile advantage over traditional telephone lines. VoIP service providers offers monthly subscription cost for as low as 60 percent compared to traditional telephone lines, which makes it cost-effective, especially for small businesses. Hence, if you are maintaining 4 telephone lines and you are averaging $300 per line in terms of monthly subscription cost, you will be able to save as much as $180 per line alone if you will use VoIP instead. That would bring down your telephone bills to $120 per line or a total of $480 compared to $1,200 in all of your 4 telephone lines.

Another noticeable feature of VoIP over traditional telephone networks is its mobile advantage. VoIP allows you to travel anywhere and could still receive and make voice calls using your VoIP phone. For instance, if you have a Detroit phone number and you are traveling in Great Britain, anyone can still make a phone call to you provided that you are connected to the Internet. In addition, your VoIP phone can integrate with other services provided over the Internet such as data exchange, audio conferencing, and video conversation. Such advantage, within cheaper cost, is possible using the VoIP communication system.

The VoIP market is not just expanding on United States, Canada, and European territories alone. In fact, the Asian VoIP market is also making its way as one of the huge-expanding VoIP markets around the world. The revenues of VoIP usage in Asia is projected to reach $10 billion in 2009 from $5.5 billion reported in 2004. Most Asian VoIP users utilize the broadband-based phone system to make international calls, which is said to be a major development in the VoIP market in Asia. Currently, there are approximately 8.7 million existing VoIP lines in use in Asia.