Compatible with many corded and cordless telephones including the following manufacturer models (as well as many more):

Aastra : 9120
AT&T: 955
Avaya : 3641, 3645
BT : Converse 2025, Diverse 6210, Diverse 6410, Diverse 7110, Diverse 7150, Diverse 7410, Diverse 7450, Inspire 1500
Cisco : SPA Series
Engenius : EP801
Ericsson : DT590
LG : 7016D, 7024D, LDP7008D
Linksys : SPA921, SPA922, SPA941, SPA942, SPA962
Panasonic : Advanced Hybrid KX-T7720, Advanced Hybrid KX-T7736, Advanced Hybrid KX-T7737, Advanced Hybrid KX-T7750, Multi-cell KX-TD7680, Multi-cell KX-TD7690, KX-T7625, KX-T7630, KX-T7633, KX-T7636, KX-T7667, KX-T7668, KX-NT136, KX-NT265, KX-NT321, KX-NT343, KX-NT346, KX-NT366, KX-T7730, KX-TG8051, KX-DT321, KX-DT333, KX-DT343, KX-DT346, KX-T7735, KX-TCA155, KX-TCA175, KX-TCA256, KX-TCA275, KX-TCA355
Polycom : Sound Point IP320, Sound Point IP321, Sound Point IP330, Sound Point IP331, Sound Point Pro SE-220, Sound Point Pro SE-225, KIRK 3040, KIRK 4040, KIRK 4080
Siemens : Gigaset C470, Gigaset C475, Gigaset E49H, Gigaset S680, Gigaset S685, Gigaset S68H, Gigaset S79H, Gigaset SL610H, Gigaset SL78H
Snom : M3
Spectralink : Link 6020, Netlink e340, Netlink h340, Netlink i640, PTB 400, PTB 410, PTB 450, PTB 800, PTB 810
Tandberg : Centric MXP150, Centric MXP1000, Tactical MXP