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2. Windows Live Call - Wikipedia

   en.wikipedia.org/wiki/Windows_Live_Call

   Phone Call - PC-to Phone voice calls to landline and wireless numbers anywhere in the world (charges applied) The Phone Call service utilized Windows Live Messenger and Voice over Internet Protocol ( VoIP ) technology to provide users an inexpensive way to make domestic and international phone calls from a computer.

3. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   These applications transform standard computing devices into full-featured communication endpoints, supporting voice and video calls over IP networks while providing standard telephony functions. Most softphone clients utilize the Session Initiation Protocol (SIP), an open standard that supports various audio and video codecs.

4. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter. Sterlite Technologies Neox IPPBX, IMS - ISC, Dial Center - OmniChannel Call Center, IVR products; Sun Microsystems Sun GlassFish Communication Server

5. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

6. Textfree - Wikipedia

   en.wikipedia.org/wiki/Textfree

   TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

7. Imo.im - Wikipedia

   en.wikipedia.org/wiki/Imo.im

   imo is a proprietary audio/video calling and instant messaging software service. [1] [2] It allows sending music, video, PDFs and other files, along with various free stickers.[3] [4] It supports encrypted group video and voice calls with up to 20 participants.