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Speaking about VoIP technology is based on IP technology and uses the Internet, it also inherits all of its vulnerabilities. The consequences of these attacks, multiplied by vulnerabilities, which follow from the peculiarities of the VoIP network structure, make one think about ways to enhance protection and carefully analyze the existing IP network. Moreover, the addition of any new phone service, for example, voicemail to an inadequately protected infrastructure can trigger the emergence of new vulnerabilities. First of all, we need to figure out what security problems can appear with IP-telephony.

Virtual telephony is intended for International outgoing and incoming calls. Business becomes more available for customers from different regions and countries by using virtual phone numbers. Calls to a virtual number have the same rates as calls within the country.

A new version of the free softphone Linphone is presented, which is a cross-platform software client of IP-telephony in the SIP standard with open source. SIP client Linphone has a multilingual graphical interface based on GTK +, and supports the most common operating platforms: FreeBSD, OpenBSD, iOS, Android, Windows Phone, Windows, OS X, Linux.

Freezvon recommends installing such softphone as PortSip (PortGO) for making cheap calls. PortSip (PortGO) softphone is a softphone application designated for the business' most dependable and highlight rich correspondence applications various operating systems.

Using of virtual telephony for Android operating system helpful sides. Using smartphones and tablets on the base of Android, the user can forget about huge outgoings on international telephony. Every businessman and even private person are interested in economy of its telephony, especially when the person expects to receive a lot of inbound calls.

Abilities of virtual telephony is limitless and high-potential for business development. Advertisement is one of the most popular and wide-spread spheres today. Most of people work in this field and are satisfied with their occupation.

Invention of IP-telephony changed telecommunication forever. Now there is no difficulties in making telephone office system for corporate network without lines or connecting of direct number in other cities that seemed unbelievable many years ago.