The Order of RJ9 Headset

The RJ9 headset have line order and reverse order. If you connect to incorrect headset, The input of microphone will be small, So the voice you heard will be small or no voice.  

Line order:


Reverse order:


Product model  Order
FIP11WReverse order
IP622CReverse order
IP622WLine Order
IP652WReverse order
 If the voice is small because of you use the incorrect order, Please change the correct order headset.