Plantronics' A-10 cord (Plantronics part number 66268-02) allows you to connect a standard H-series headset directly into the headset ready jack on a Northern Telecom telephone, bypassing the need for an amplifier.
Not sure if your phone is Polaris compatible? Give us a call at 1-800-451-5067 during office hours or send us a message anytime using the contact Ahern link to the left. Please have the make and model number of your phone ready, and we'll be happy to make sure you have a compatible choice.