... , Ethernet, Phone1, Phone2Voice protocol: Session initiation protocol (SIV v2)Voice codes: G.711, G.726, G.729A, G.723.1Ringer equivalence ... /RJ-11 PortRing frequency:10-40HzFXS Port impedance: 8 configurable setting including north america 600 ohms, european CRT21Ring voltage: 60-90VrmsSecurity ...