... , G.726, G.729ABVAD, CNG, AEC, PLC, AJB, AGCFull-duplex hands-free speakerphone with AEC Network FeaturesSIP v1(RFC2543), v2(RFC3261)NAT ... : 286x89x45mmOperating humidity: 10~95%Storage temperature: up to 60°CPackingItemDescriptionGift-box measure 305x230x195 MMPCS/CTN4 PCSCarton measure615x475x208 MMN.W7.20 KGG ...