What Every Company Needs to Know About IP Telephony

Internet Telephony (IP Telephony), is the term used to define the transmission of telephone calls over the Internet. That is, without taking into account their traditional telephone equipment, computers and/or dedicated terminals, they take part in the calls and even if the telephone calls are totally or partially transmitted over the Internet.

One of the main reasons for this rapid migration to telephony on the Internet is that it makes the integration of all media and communication devices much easier. In this way users can be in contact with anyone, from anywhere they are and in real time. In summary, IP telephony allows Unified Communications to be part of the company’s environment, helping companies save money and increase employee productivity. The history of IP phones Dubai began only a few years ago, in 1995, when these launched firstly over the Internet.

How does Internet Telephony work?

The configurations or scenarios of IP telephony use are classified by the type of equipment used when making and receiving telephone calls. The call can be initiated or terminated either by a PSTN device (Public Switched Telephone Network) or a computer (PC or laptop), on each side of the call; Then there are four different types of possible configurations:

1. Computer to Computer

This scenario is common with users who already have access to the Internet and a computer with audio capability (sound card). In this case a software-based phone can be used to start and end phone calls on both sides. There are several phones based on free software in the market. This pure IP telephony scenario can benefit the integration of other Internet services such as email and instant messaging.

2. PC to Phone

In this scenario, the calling computer can also contact traditional telephone users (PSTN). To achieve this, a VoIP Gateway is necessary to convert the Internet call into a PSTN telephone call. The closer the PSTN phone user’s gateway is, the lower the cost of the phone call will be.

3. Telephone to Telephone

This case applies to traditional telephony users who do not have access or are not interested in using their computers to make or receive calls and still want to benefit from the savings in telephone call costs obtained by VoIP telephony. This could be very good for the case of mobile phone users. In this scenario, the phone call has to pass two Gateways: PSTN-to-Internet and Internet-to / or-PSTN.

4. Telephone to Computer

In this scenario, ordinary telephone users can contact users of VoIP phones, again through an operator or VoIP Gateway. It is exactly the inverse case of the scenario from a computer to a telephone.

Components of an IP telephony system

  • Equipment / devices: as seen in the diagram above, these devices can be traditional telephones (analogue / GSM) and / or computers (PC or laptops) equipped with a sound card.
  • VoIP Gateways: These are necessary if a traditional telephone is used on either side of the telephone call.
  • VoIP / SIP Proxy: The function of a VoIP / SIP proxy or server is to provide centralized call management functions, especially in a business environment.

Sophisticated standards have been created so that all these components communicate with each other. The challenge so far in IP telephony has been to break the proprietary barrier and create telephone exchanges where the components are not tied together.

An IP telephone exchange that makes sense for companies is what allows companies to have freedom of choice between the wide variety of IP phones and VoIP Gateways, according to the budget and needs of the company.

The Benefits and Future of IP Telephony

Despite the fact that Internet telephony is a relatively new technology, its reach is growing exponentially, mainly due to the colossal growth of the Internet. While many at first saw in VoIP an exclusive technology for people at home, the Internet telephony for companies has already become a reality. Research shows that sales of IP telephony equipment continue to increase and with a high growth rate.


As long as phone systems manufacturers continue to strive to develop innovative VoIP telephone exchange solutions that are easy to install, configure, manage and use, and at the same time ensure that they provide mobility, productivity and cost reduction benefits to businesses, there are reasons to believe that IP telephony is here to stay permanently.


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