Subscribing a CS50 Replacement Headset or a CS55 Replacement Headset First, you want to make sure you have the correct headset, since the CS50 Replacement Headset and the CS55 replacement headset for the wireless systems look identical but work on different frequencies, so they’re NOT interchangeable. You can find the system model number on a label under the base. The CS50 Replacement Headset is part … Continued
