Hi guys , 
Do you think it's possible to use two headset withe the same phone (69xx).
i have agent + supervisor , 
The supervisor want to plug the second headset in jabra adaptator to listen to the communication. it work like that with old nexpan system.
I proposed silent monitoring , but he prefer to move the agent office  ....
I use the same installation with 6920 phone  : when i'm in communication with the first headest , if i plug the second headset , i have voice in the second headset not both.