Call actions
During calls (both audio and video), you can
End the call
Mute the microphone
Change to speakerphone
Open the keypad
Change from an audio call to a video call
Change from a video call to an audio call
Place the call on hold
Make a new call
Transfer the call (attended or unattended)
Park the call
Make a conference call
Add more participants (conference call)
Merge two separate calls (conference call)
Swap two separate calls (conference call)
View participants (conference call)