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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.

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.