This lets you get get channel commander so that you can talk with anyone else in TeamSpeak that has channel commander no matter if they are in same channel as you or not.
settings -> whisper -> whisperlist -> new -> "hotkey" -> ok -> set a hotkey to answer -> set whisper to, to "Groups" -> set Group Whisper Type to "Channel Commander" -> set Group Whisper Target to "All Channels" -> Apply -> right click name and press "Channel Commander"