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Cisco VIC3-4FXS/DID 4PORT Voice Interface Card Fxs & DidCisco VIC3-4FXS/DID. Voice codecs: G.711,G.722,G.723.1,G.726,G.728,G.729,iLBC, Compatible operating systems: Cisco IOS. VoIP protocols: cRTP, Supported network protocols: FXO/FXS,DTMFFeatures of Cisco VIC3-4FXS/DID 4PORT Voice Interface Card Fxs & Did Package length: 9.65" Package width: 7.3" ..