... plug this modular plug into the headset jack on your phone (phone must be headset-ready, see list below) Superior sound quality ... , Dialogue 4186, MD110 ESI: ESI-48-Key IP Feature Phone and 48-Key Digital Feature Phones General Electric: GE Telephone Model 2-9451 ... , IP600 & IP601 IP Phones Safecom: SDSIP-500IP SIP Phones ShoreTel Phone: IP100, IP212K, IP230, IP265, IP530, IP560, IP560G, IP565 Siemens/ ...