Harris Communications VM Inline Voice Magnifier

It goes between the handset and the phone. The handset plugs in on one side and the little phone cord that came with it plugs in too were the handset was plug into the phone. The only thing I can say is that you would have to try it with the system because they are made to work on analog phone lines but the company does make a system that helps a person who is hard of hearing and they have worked with phone systems. 

We do have a 30 day return policy so if it did not work they could send it back.