The remotes work in conjunction with GC-5002T1, GC-5003T2 and GC-5003T3 handsets, GC-4017M2 and GC-4017D2 hands-free handsets, or GC-2001W3, GC-2001D1, GC-2001D3, GC-2001P1 and GC-2001P4 speakerphone devices, as well as for receiving calls from the call buttons GC-0422W1, GC-0422W2, GC-0423M1 and GC-0423W1 via signal LAMPS GC-0611W2 AND GC-0611W3.