The main difference between a traditional telephone communication and an IP informational exchange is means of operation. A classic system is based on a channel commutation, when two call participants are directly connected. An IP PBX is developed for data exchange through data batches without a direct connection between subscribers. There are a few advantages of IP PBX systems:

• Low rates on international and interurban communication. Such a criteria is an absolute benefit for business, which include a number of subsidiaries and offices in different parts of the world. Some PBX modifications imply a free of charge international calls service.
• PBX sustainability. Common telephone systems are supported by service providers, who occupy a certain communication channel. As a result, all the communication procedures are linked to a provider capacity and service coverage. However, a virtual communication system provides wider business opportunities by servicing world wide without reconstruction and adjustment of equipment.
• Unlimited amount of communication channels. Functionality of an IP PBX depends only on the Internet speed and traffic capability.
• Video conferences. Modern PBX systems are suitable for online corporate meetings, including a score of employees. Originally, the purpose of PBX systems development was an integration of voice, video and data facilities into a traditional business activity. This function allows to simplify training procedures, project discussions and planning briefs. It is also a personnel management and supervision tool.