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2. Comparison of user features of messaging platforms - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_user...

   Multiple destinations may be specified that ring simultaneously for incoming calls. Service establishment requires a United States telephone number. A user may answer and receive calls on any of the ringing phones as configured in the web portal. During a received call the user may switch between the configured telephones. [69]

3. FaceTime - Wikipedia

   en.wikipedia.org/wiki/FaceTime

   Cellular talk time/minutes are not used after switching from a voice call to a FaceTime call. FaceTime calls can be placed from supported devices to any phone number or email address that is registered to the FaceTime service. A single email address can be registered to multiple devices and a call placed to that address rings all devices ...

4. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   Conference Control performs resource allocation, management, and routing. This layer along with the User Interface creates meetings (scheduled or unscheduled) or adds and removes participants from a conference. Control (Signaling) Plane contains the stacks that signal different endpoints to create a call and/or a conference.

5. List of video telecommunication services and product brands

   en.wikipedia.org/wiki/List_of_video...

   A typical low-cost webcam (a Microsoft LifeCam VX-3000) for use with many popular video-telecommunication programs (2009). This list of video telecommunication services and product brands is for groupings of notable video telecommunication services, brands of videophones, webcams and video conferencing hardware and systems, all related to videotelephony for two-way communications with live ...

6. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   Voice encryption (SRTP with SDES or ZRTP) and signaling encryption , multiple realms authentication mechanism No limit Blockchain ID-management, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing

7. Comparison of instant messaging protocols - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_instant...

   The following is a comparison of instant messaging protocols. It contains basic general information about the protocols. ... channel or conference support Audio/VoIP ...