First Step:

1 enableChannel [true,false]; //Side channel write only

Second step:
Switch to another channel where you are allowed to talk

Thrid step:
Activate speaking, via permanent toggle on, so that you kee talking until you press yourspeak key again

Step four:
Use you channel switch keys to switch back to the side channel in this example

The results ist:
You are speaking in the sidechat. Once you press the speak key again and try to speak while the side channel active it does not work, but as soon as you use switching between channels, you can speak everywhere