Add 'Withdraw request to speak' button
Disable buttons before connecting to server
OperatoCall button. RTS with ToggleButton
Disable control buttons until a call is established
Mute button as ToggleButton
Automatic unmute on operator call request
Hide macro buttons if no macros found
Add mute/unmute DMTF macros
Separate mute with DTMF and local microphone mute