A. Remote party identifier
This field is composed with
- the name if the phone number is associated with an existing contact,
- the phone number.
B. Connected call indicator
This fiel is added with
- a stopwatch showing in real time the call duration
- an icon 
indicating by its presence the voice encryption with a powerful algorithm (AES256). This security is obtained according the negotiation of the SRTP parameters with the remote party.
C. Photo
The picture of the contact is displayed if exists.
Else the picture 
replaces the photo.
D. Hold
Hold 
and resume 
the remote party’s line.
E. Mute
Disable 
or enable 
the microphone.
F. Speaker
Enable 
or disable 
the amplified listening.
G. DTMF keypad
Displays the multifrequency keys keypad (or DTMF) :
H. Call information
Provides some information about active call :
I. Line manager
Open the line manager offering the following features :
- multi-line switching between waiting participants,
- the creation of a new line,
- the transfers,
- conferences,
When the icon of this key is red 
this indicates that at least 2 lines are managed.
J. Release
Terminate the call and go back to the initial screen.