Linphone is an open-source voice-over IP softphone, SIP client, and service. It may be used for direct audio and video calls through any VoIP Softswitch or IP-PBX.

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Linphone.org hosts a free SIP service that allows users to make audio or video calls using SIP addresses via the domain sip.linphone.org. You can create your own sip address, for example, “sip:[email protected],” using the form below, and your friends can call you using this SIP address.

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