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That is a special voice application working on voice over IP and designated for Android OS. You may install this app to your smartphone and use it for making cheap outgoing calls or receiving free VoIP calls to your mobile. You do not need any other hard equipment.

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If you were looking for good call application, we recommend you to install Linphone. If you are iPhone user this app will be ideal for you. You can make outgoing calls to any of world corner and you do not need any additional expensive equipment – just your phone and this app. It should be mentioned that using this app is impossible without having SIP-account. In this article, we are going to inform you about SIP telephony technology and installation of Linphone to your iPhone.

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Another one great voice program for receiving and making calls is available for your Linux OS. That is a program client of IP-telephony permitting to make voice and video calls, plus exchanging messages online.

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The need for advertising and development to move scientific and technological progress at a pace comparable only with games. It's no wonder, that for intercession in the Internet, voice communication also goes away, because IP-telephony, other things being equal, is cheaper and more convenient.

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Twinkle is free open-source application for voice telecommunication. This program was created especially for Linux system and using Qt interface for its graphical interface. Moreover, it can be used as IP phone to IP phone telecommunication. Media streams are going via RTP. This application also supports messages exchanging and contact lists between users. You may check lots of other useful features available thanks to this program.

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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.

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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.

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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.

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