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 groups involved.
Note: Swiping up within the action bar reveals hidden symbols.
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).