... : Technology Wired Integrated Switch: 4-port switch Framing Format: G.711, G.723.1 Data Link Protocol: Ethernet, Fast Ethernet Switching ... .168, ITU T.38 Data Compression Protocol: G.729, G.711, G.723.1, G.726 Expansion / ConnectivityInterfaces: 2 x phone ... into a high-quality high-value telephone service. Linksys RTP300-NA Unlocked 2xVoIP 4x10/100 RJ45 same spa2102 function