What is the impedance of a Headset or Handset?
Most headset and handset impedances are in the range of 600 Ohm to 10K Ohm. These connections may be directly bridged using a “Y” connector, which ties to the logger. In call center applications, the connection to the headset may be made inside the telephone itself, and the audio may be back-hauled through an unused pair on the cable, or through a separate recording cable.