I have noticed many people having issues getting voice chat to work, or even realize its in game. This guide is intended to help you solve crashes or issues with VOIP.
1. From the main menu, you can press O or click on the settings button on the bottom of the screen.
2. Click “Key Bindings”
3. Press E 3 times, or select the common tab at the top
4. From the top, 4 down you will see an option for voice chat
5. Rebind to preferred key (see below for important info)
Currently it appears that mouse buttons and certain keys either do not work, or cause issues. Currently myself and others seem to have good luck with using the ~ (tilde key).
Start transmission under the soldier tab is not voice chat, I’m currently not sure what this does.
You will know your talking if you see a speaker icon next to your name on the bottom left of the screen. This is also true for others who are talking.
Currently voice chat only exists between squad members, you can not voice chat to your team. You can however hit enter, then tab to cycle between various chat types.
For example, I have found that a few people (myself included) like to bind things like VOIP to our mouse (mouse4, mouse5) and for whatever reason this does not work. If you have voice chat bound to something and can not see the icon, simply try another key.
If you do see a speaker icon but nobody can hear you, this is likely something with your system. It is also possible that if your in a random squad, they simply are not responding to you.
When talking with others it appears that this is related to having voice chat bound to keys that have other things attached to them by default, even if the original has been rebound. For example the default crouch button C, if you moved crouch to X, and voice chat to C, some people have experienced crashing or other odd issues when pressing C afterwards.
This can be fixed by simply finding a key with no default binding such as ~ (tilde key above tab on the left hand side).
Thanks to Architect of Sin for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.