Introduction to Your Extension
MD Evolution – Dialog 4425 IP Vision34
Transfer 8 Transfer Key
This fixed function key transfers a call on your extension between 
two online calling parties.
See also the “Operations during a Call” section.
Ô 9Line Keys
Your extension features three (3) line keys that enable you to 
process up to three (3) incoming and outgoing calls simultaneously. 
The first two keys, L1 and L2, are standardised, multi-usage lines, 
while L3 is reserved for outgoing calls.
See also the “Operations for Incoming Calls”, “Operations for 
Outgoing Calls”, and the “Operations during a Call” sections.
Ô 10 Programmable Repertory Keys
Your extension features twelve (12) repertory keys that can be 
customised for making specific internal or external calls, or for 
direct access to certain services.
See also the “Physical Programming of Your Extension” section.
É 11 Mute Key
This key activates or deactivates the microphone on your extension 
when you are operating in handsfree mode or the voice transmission 
feature when you are operating in handset mode. It also controls 
your extension’s silent ringing function.
See also the “Operations for Incoming Calls”, and “Operations 
during a Call” sections.
 12 Loudspeaker Key
This key activates your extension’s handsfree mode. Pressing this 
key simply toggles between the handset and handsfree modes.
See also the “Operations during a Call” section.
ì 13 Volume Control Keys
During a call, these two keys control the listening volume on your 
extension’s loudspeaker or handset. When an incoming call is 
ringing, these keys also control the ring volume for your extension.
See also the “Operations during a Call” and “Physical Programming 
of Your Extension” sections.
í 14 “C” Key (Clear or Erase)
This key disconnects an incoming or outgoing call executed in 
handsfree mode.
See also the “Operations for Incoming Calls” and “Operations for 
Outgoing Calls” sections.