As an alternative for proprietary Skype/Hangout we sometimes use Mumble.
It is the only Free Software solution for audio conferencing that is working. It is designed for audio-conferences for 40+ people, but one can just use it for two also
It’s centralised (needs a Server), but we can use the one from voip.open-resource.org.
A headset with microphone is strongly advised! It minimizes the echo a lot. If not available, then please configure “Push to Talk” - Then it works like a walkie-talkie, where you have to push down a button (e.g. CTRL) while speaking.
How to install & set up Mumble:
Linux (Debian/Ubuntu): open a console, “sudo aptitude install mumble<enter>”, and you’re done installing.
- go to http://wiki.mumble.info/wiki/Main_Page
- in the “Download Mumble” section, there is a column named Stable Release - Click on the version number to download the installer
- Open the installer you’ve downloaded.
- A Windows warning should appear (Do you want to run this file?), click “Run”.
- The installer starts,
- click forward,
- check accept the GPL,
- click forward, forward, install
- Agree to the Windows warning about “is this program allowed to make changes to your computer”
- Click “Complete install”
When Mumble starts, it ask to which server to connect. Click on the second button “Add New…”
In the following dialogue
- In the first field, enter a name you recognise, e.g. “transformap”
- in the second “Address”-field, enter voip.open-resource.org
- in the last field, enter your name - this is what other users will see, e.g. “John Doe”. You are free to choose anything you like, no account needed!
- click “OK”
when using Mumble the first time, it is recommended to run the audio wizard. This isn’t always needed, but if you cannot hear/talk or your colleagues complain about your audio quality, do it
- Close the “Mumble Server Connect” dialogue.
- In the top menue, select “configure” → “Audio Wizard”
- Click “Next”. Top should read “device selection”: Select the microphone you’re working with. Choose your headset, and enable “Echo Cancellation” if possible. You should hear yourself in the headset if you’ve chosen the right devices. If okay, click “Next”
- “Device tuning”: drag the slider to the left, until you hear jitter. Click “Next”
- “Volume tuning”:
- Open your sound control panel (the Windows/Linux one) speak loudly, and drag it the mic slider in the sound control panel down until the moving bar doesn’t touch red.
- now speak silently and drag the slider in the mumble panel, until speech is in green and silence is in blue.
- click “Next”
- “Voice activation detection”: We recommend the first option “Push to Talk”. Select it, and click into the box right. It displays “press shortcut”, then press the key you want to use as a “Walkie-Talkie” key. We recommend the right CTRL key. When finished, click “Next”
- “Quality & Notifications”: Select “high” quality if you are on a at least ADSL internet connection. In the second field, disable “Text-to-Speech” notifications. Click “Next”.
- Positional Audio isn’t needed, click “Next”
- For the last time, click “Next” and you’re finished.
For connecting to our server:
- In the top menue, select “Server” → “Connect”
- Select the entry you created before (probably “transformap”) and click “Connect”.
You should see yourself (A mouth with your username) and some chatrooms (symbol: radio dish). You can drag yourself with the mouse in any chatroom.
When anybody is are talking, his “mouth” turns red. You are only heard by others if Your mouth is red. If your mouth stays gray while talking, try pressing the assigned “push to talk”-button (recommended was right CTRL key). If nobody hears you, walk through the audio wizard. There is a text-chat on the left pane - you e.g. use it to post hyperlinks. Or ask the others “can you hear me?”This How-To was orignially posted in our [old wiki](http://wiki.14mmm.org/How_To/Mumble/).