<Ctrl>+Q      quit the phone 
<Ctrl>+H      open online help  
<Ctrl>+D      activate the DTMF panel  

<Ctrl>+P S    open SIP preferences  
<Ctrl>+P A    open audio preferences
<Ctrl>+P V    open video preferences  
<Ctrl>+P 1    open session typ 1 preferences  
<Ctrl>+P 2    open session typ 2 preferences  
<Ctrl>+P 3    open session typ 3 preferences  
<Ctrl>+P 4    open session typ 4 preferences  

<Ctrl>+B      open phoneBook  

<return>      start audio call
<Ctrl>+N      start audio call
<Ctrl>+A      start audio+video call  
<Ctrl>+V      start video call  
<Ctrl>+1      start ext1 call  
<Ctrl>+2      start ext2 call  
<Ctrl>+3      start ext3 call  
<Ctrl>+4      start ext4 call  

<Ctrl>+x  means, press the Ctrl/Strng key and the x key together
<Ctrl>+x y  means, press the Ctrl/Strng key and the x key together,
                   release Ctrl/Strng and press y