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2. Windows Live Call - Wikipedia

   en.wikipedia.org/wiki/Windows_Live_Call

   Video Call - Free PC-to-PC video calls to Windows Live Messenger contacts 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 ...

3. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   TV cams enable people to make video calls using video calling services, like Skype on their TV, without using a PC connection. TV cams are specially designed video cameras that feed images in real time to another TV camera or other compatible computing devices like smartphones, tablets and computers.

4. Skype - Wikipedia

   en.wikipedia.org/wiki/Skype

   [60] [61] A Skype user can have local numbers in any of these countries, with calls to the number charged at the same rate as calls to fixed lines in the country. Skype supports conference calls, video chats, and screen sharing between 25 people at a time for free, [62] which then increased to 50 on 5 April 2019. [63]

5. Linphone - Wikipedia

   en.wikipedia.org/wiki/Linphone

   Linphone (contraction of Linux phone) is a free voice over IP softphone, SIP client and service. It may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX . Linphone also provides the possibility to exchange instant messages.

6. FaceTime - Wikipedia

   en.wikipedia.org/wiki/FaceTime

   In iPhone, if a phone call was pending and the user attempts to answer, the video call ends and the phone call began with the next user. Support for group video conferencing was added with the release of iOS 12, allowing up to 32 people to participate in a video call simultaneously.

7. Web conferencing - Wikipedia

   en.wikipedia.org/wiki/Web_conferencing

   Vendor-hosted web conferencing is usually licensed as a service based on one of three pricing models: a fixed cost per user per minute, a monthly or annual flat fee allowing unlimited use with a fixed maximum capacity per session, or a sliding rate fee based on the number of allowed meeting hosts and per-session participants (number of "seats").

8. Telegram (software) - Wikipedia

   en.wikipedia.org/wiki/Telegram_(software)

   It allows users to exchange messages, share media and files, and hold private and group voice or video calls as well as public livestreams. It is available for Android, iOS, Windows, macOS, Linux, and web browsers. Telegram offers end-to-end encryption in voice and video calls, [10] and in optional private chats, which Telegram calls Secret Chats.

9. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Instead, they must now determine the actual network of every number before routing the call. [44] Therefore, VoIP solutions also need to handle MNP when routing a voice call. In countries without a central database, like the UK, it may be necessary to query the mobile network about which home network a mobile phone number belongs to.