Shows information about the call such as phone number/contact with profile picture.
Displays additional information about the call such as call time, call paths and the called group.
Note: Swiping up within the action bar reveals hidden symbols.
Opens the door (only for door calls/conversations).
Switches on the door light (only for door calls/conversations).
Turns the speaker off again.
Starts a new call (query call).
Resumes the call (reconnects).
Mutes the microphone (mute).
Turns the microphone back on (unmutes it).
Initiates transfer of the call partner (transfer without announcement).
Sends DTMF signals (digits in the ring).