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[hemmerling] Internet Messenger, IP Telephony, Video Conferencing, Voice Over IP, Unified Messaging, Unified Communications

General Voice Over IP Resources

Open Voice Over IP Protocols

World Time

Internet Messenger / Telephone / Videophone Clients

AIM ( AOL Instant Messenger )

  • AIM ( AOL Instant Messenger ).


Collanos Phone



  • iVisit - the free iVisit Desktop, the free iVisitskype Presenter.


G Data Secure Chat

Gadu-Gadu ( GG )

  • Poznaj GG - The Polish #1 messenger, #1 messenger of Poland.
    • Poznaj GG "Zarejestruj sie" - “Register”.
      • Na telefonie ( Android, MacOSX ).
      • Na komputerze ( Windows, MacOSX ).
      • W przegladarce ( Browser ).
    • Login.
      • Login at desktop PC browser:
        • “Zaloguj się”.
        • The menu option might be hidden, if the browser window is not wide enough :-( ( i.e. the screen is less than 1280 pixel width ).
      • Login at smartphone & desktop PC browser:
        • In the green widget at the bottom “Napsz do nas”, click on the button “Wyslij”.
        • In the loaded widget page, at “Aby kontynuowac rozmowe na gg”, click the link “Zaloguj sie”. The login screen opens :-).
        • After login, load the URL in your browser, to start using the messenger :-(. Load a browser bookmark, or type in the URL manually...
    • Logout: At the left main menu bar item “GG”, select “Wyloguj” to logout.

ginlo ( formerly: SIMSme )

Google Hangouts ( formerly: Google Talk, Google Voice )

The Service




Google RCS



  • imo for Win, MacOSX, Android, iPhone - “imo free video calls and chat”.
  • “To use imo for Windows Desktop, you must first install the app on Android ,iPhone or Windows Phone” :-(, 2020-11.


The Service



  • If you try to login at a PC by browser, and Instagram asks you to enter a 6-digit number sent by SMS,
    • Instagram just sents the SMS if Instagram is installed on the smartphone :-(.
    • So if by some reason, Instagram is not installed on a Smartphone, but you get asked to enter the 6-digit number, Instagram did not sent you the SMS with the number :-(, so you can't login by browser. Solution: Install Instagram on your Smartphone, again.



Kakao Talk

  • Kakao Talk for Windows.
    • A Kakao account can just be created on a mobile device. You can´t create a device by the Windows application, nor by the website.



  • LINE - “Free Messaging Whenever, Wherever. Send free one-on-one and group texts to your friends anytime, anywhere! LINE is available for a variety of smartphone devices (iPhone, Android, Windows Phone, BlackBerry, and Nokia) and even your PC”.
  • LINE "Download" for Windows.
  • Use of multiple devices is supported :-).


  • Mattermost - “The Only Open Source Collaboration Platform for Developers. Bring your tools and teams together in a fully secure location”.
    • Free self-hosted software “Enterprise E0”:
      • Self-hosted one-to-one and group messaging, file sharing and search.
      • Native apps for iOS, Android, Windows, Mac and Linux.
      • Unlimited integrations.
      • Tools for custom branding.
      • Unlimited search history.
      • Multi-language translation.
      • Multi-factor Authentication.
    • Commercial hosting services.
  • The user interface of the chat function looks like a “Slack” clone :-).


Microsoft NetMeeting

MSN Messenger, Windows Messenger, Windows Live Messenger, Microsoft Office Communicator

Windows Live
Windows Messenger
Microsoft Office Communicator

Microsoft Teams

The Tool


The Service
  • The free Skype log viewer Nirsoft "SkypeLogView" for Windows.
    • The default file that Skype looks for conversation is main.db
  • “SkypeLogView” asks for and detects automatically the Skype user directory on Window:
  • As of 2019-01, you can remove messages ( and so sent pictures ) as sender :-(. “This message has been removed” :-(.
  • Skype search:
    1. For MSN IDs: “live:yanned”.
    2. For names: “yanned” - Doesn´t look for Skype ID or MSN IDs :-(.
  • How to save the personal data for a new installation of Skype?
    • “Options / Privacy settings / Save your history to CSV file” - Click on “Export Chat History”.
      1. Press “WindowsButton R” and open the Windows explorer by ”%appdata%\skype”.
      2. Save the directory “My Skype Received Files” and the directory with your Skype name. If you login by a Microsoft account, the name of the directory starts with “live#3”.
    • Skype, classical Desktop Application for Win7, Win8, Win10.
    • Skype Windows App for Win10.
        • With the latest version 12.X update to the new Microsoft Skype for Windows 10 (Skype UWP) application, the procedure for how and where the messages are saved has changed quite dramatically.
        • The local settings are now available in this folder:
          • ”%localappdata%\Packages\Microsoft.SkypeApp_kzf8qxf38zg5c\LocalState\<Skype Name>”.
          • "C:\Users\<username>\AppData\Local\Packages\Microsoft.SkypeApp_kzf8qxf38zg5c\LocalState\<skype_name>"
        • The well known main.db file is still present in this folder, but it is no longer used to save chat messages. Also other data used to be saved in this database file are now missing.
        • Instead, the new Skype UWP application is now using another database file, skype.db. Inspecting this database file with a SQLite browser, shows that the chat messages are now saved in this file in the messages Table, but under different headings..
  • Business Skype doesn´t save chat messages, after finishing or even halting a chat. I was told by experts, that in case that Microsoft Outlook ( not: Outlook Express ) is installed, chats might be saved automatically.

Miranda IM







Signal Private Messenger



Speak Freely



  • “talque ist der neue Messenger, mit dem Sie ganz einfach mit anderen chatten, gemeinsame Termine finden, große Files versenden und Videocalls führen können. Alles direkt im Browser”.
  • “Um einer Konferenz oder einem Netzwerk beizutreten, geben Sie bitte den Zugangscode ein” ⇒ “5gconf19”.


  • Telegram for Browser ( “Web-version” ), Android,... ( but not for native Windows :-( ).
  • Your mobile phone number is your ID!
  • My negative experience:
    • If a profile mutes somebody, the owner of the muted profile doesn't have neither access to the profile anymore, nor to the past messages, immediately :-(.
    • If a profile is deleted by the owner, past messages are still readable by anybody who got the messages ( ok ).


Tencent ( QQ, WeChat )



    • The Web WeChat ( Login at ) requires a mobile device equipped with photo camera and with working “WeChat” :-(.
      1. Open the website Web WeChat with your web browser ( e.g. Firefox ) on your desktop computer, running Windows, Linux,...
      2. Execute the WeChat function “Scan QR Code” and scan the QR code on the website. Do not use other external QR scanner applications - Attention: You can´t establish a WeChat connection by scanning the QR code by an external QR scanner application and typing in the URL at your browser!
      3. By magic, now on the web browser of your computer, the WeChat application starts as browser application.
    • WeChat FAQ, WeChat Mobile FAQ - “WeChat ID is your unique name that friends can search for to find you. Wechat ID can be changed once only. Nickname is your primary name shown to other WeChat users, and it can be changed as often as you like”.




  • Longin on BlueStacks 4 ( Android 4.4.2, SDK 19 ) is refused by the error message “You are visiting our service too frequently” :-(.


      • If you update from an older version then do the following: Make sure both versions are not running and then copy the following three files from your old version over to the new version into the exact same locations:
        • “bin\buddy-list.txt”
        • “bin\Tor\hidden_service\hostname”
        • “bin\Tor\hidden_service\private_key”
    • heise Download "TorChat" - “Anonymer, serverloser Instant Messenger, der auf den “hidden services” von Tor basiert und das Versenden von Textnachrichten sowie den Transfer von Dateien zwischen einzelnen Tor-Nodes ermöglicht; die Windows-Version läuft ohne Installation und weitere Systemanforderungen”.



  • Tox - “The idea was to create an instant messaging application that ran without requiring the use of central servers. The system would be distributed, peer-to-peer, and end-to-end encrypted, with no way to disable any of the encryption features; at the same time, the application would be easily usable by the layperson with no practical knowledge of cryptography or distributed systems”.
      • “qTox is a powerful client based on Qt, with an intuitive and feature rich user interface as well as a fast core written in C++. qTox runs on Windows, Linux, MacOS and FreeBSD and offers text messagging, audio and video calls, screen sharing and file transfers. Additionally it has support for text and audio group chats as well as Identicons as avatars”.
      • My experience in 2018-01:
        • With the Windows edition, by mouse-rightclick, there is the menu option “Save chat log” to save the chat messages. Indeed, chat messages are not lost, if you quit qTox. You may “Clear displayed messages” anyhow.
      • Files ( e.g. photos ) sent by messenger are not available both on the sending and receiving messager anymore, if you quit the messenger and then run it again :-(. So you must save files before you quit a session :-).
      • Using qTox requires a login password. So your chat messages might be low-level protected, against against non-computer expert who gets brief access to your computer.
      • qTox doesn´t accepts Tox IDs with broken lines :-(, you must provide an ID as single-line String.
      • uTox is a “light” Tox, single-file-ready-to-go, without installation on Windows.
      • Using uTox doesn´t require a login password by default. At “uTox Settings / Show password field”, you may set a password.
      • As of 2018-02, there is no menu option to export a .tox profile :-(.
      • uTox accepts Tox IDs with broken lines :-).


    • “In some clients you can export your ID. This will create a .tox file. If you then copy the file to another device and import the ID (supported on some, not all, clients) you will be able to use the same ID on both devices”.
    • “You can just copy your .tox file to another device, but then you can't be online on both of them at the same time. I would recommend using a separate profile on each device”.
    • “In Antox: Swipe right > profile > export profile > select directory. That will export your .tox profile file to the selected directory. From there transfer it to your pc. I know you can import it using qTox, but for uTox the instructions will be different”.
    • “Wait for toxcore to officially support multiple devices”.



  • VIPole ( Promotion Code ) for Windows, Linux, MacOSX, Android, iPhone - “Secure messaging, video, calls and sharing”.
    • “Length of secret phrase must be more than 8 symbols. Secret phrase must differ from password”.
    • Smartphone App has the option ”[x] Show deleted records” for each chat partner :-). I didn´t find that with the Windows App :-(. The Smartphone App displays deleted records by the italics text ”Deleted”.
    • Windows App has the general option “Files / File storage options” :-). I didn´t find that with the Smartphone App :-(.
    • The Windows App has a seach function for the chat with a chat partner :-), both in standard mode and history mode. For the Smartphone App, you have to switch into the “History” mode for searching.


  • Viber for Windows.
    • Viber 4.2.1 crashes on my Win7 computer with XP2400 CPU...
  • You may activate both one smartphone as “premier device” and one “secondary device”, e.g. a PC Desktop.
  • As of 2019-04, I am unshure if you may run “Viber” on three devices...
  • Your mobile phone number is your ID!

WEB.DE MultiMessenger


  • Webphone
    • Webphone - free softphone for Windows.
    • Netspeak Webphone - discontinued commercial softphone for Windows. I got installed the “LITE” version (with unlimited connection duration, but connects to 1 line only at a time), activated by the license key distributed with CREATIVE SOUNBLASTER cards.


The Service




Yahoo Messenger, Yahoo Squirrel

Yahoo Messenger

    • Yahoo Messenger - Build number of the current release ( e.g. “Click Download Now to begin downloading and installing Yahoo! Messenger 11.5 ver.” ).
    • Yahoo Messenger is the latest release for W2k ( and maybe even for Win98SE ).
    • Yahoo Messenger is the latest release for computers with PentiumIII CPUs, for Win7. Yahoo discontinues it's services with this version as of 2016-08-30 :-(.
    • The new “Yahoo Messenger 0.8.109” ( of 2016 ) may just be operated on computers with PentiumIV CPUs on Win7 / Win8 / Win10,...
    • “Yahoo! Messenger for the Web service”.
      • Free calls to 1-800 telephone numbers of the US telephone grid.
      • Free phone-in telephone number in USA, UK, France.
    • Yahoo Messenger will no longer be supported after July 17, 2018. Until then, you can continue to use the service normally. After July 17, you'll no longer be able to access your chats and the service will no longer work. Read our FAQs below for more info on what this means for you.
    • Is there a replacement product for Yahoo Messenger? “There currently isn’t a replacement product available for Yahoo Messenger. We're constantly experimenting with new services and apps, one of which is an invite-only group messaging app called Yahoo Squirrel (currently in beta). You can request an invite at”.

Yahoo Squirrel by Oath

Recommened Internet Messenger / Telephone / Videophone Clients suggested for secure Business

  • Threema.
  • ginlo ( formerly: SIMSme ).
  • Wire.
  • Stashcat.

SMS Messenger Software

Internet Audio & Video Conferencing Systems

Internet Audio and Video Conferencing Systems

Webcast, Webinar and Online Conference Services

Webcam Services

Webcam Services and Webcam Software

Peer-2-Peer (P2P) Networks

  • Pango -free P2P network software.

Internet Location Server ( ILS ) & User Location Service ( ULS )

  • VideoFrog - NetMeeting Server Directory, Cu-SeeMe Reflector Directory.

Telephone Servers for POT and VoIP

Telephone Number Databases - Telephone Books

Chat & Internet Relay Services, Internet Relay Clients ( IRC )

Telephony Services


  • DIE ZEIT "GCHQ. Britischer Geheimdienst spionierte Millionen Yahoo-Webcams aus", 2014-02-27 - “Der britische Geheimdienst GCHQ hat einem Zeitungsbericht zufolge jahrelang Bilder der Webcams von Yahoo-Nutzern abgegriffen. Das Programm mit dem Code-Namen Optic Nervehabe von 2008 bis 2010 Standbilder aus den Webcam-Chats des Internet-Konzerns gespeichert, berichtete der britische Guardian”.

Forums, Newsgroups

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