OverviewAcom211/2 is a kind of voice communication terminal which is based on wide band and independent of PC (personal computer). FeaturesSupport SIP 2.0 (RFC3261) and correlative RFCsCodec:G.711 A/U Law, G.723.1, G.729a/b, G.722,G.722.1, G.726Echo cancellation: Support G.168, and Hands-free can support 96ms, Hand free Speaker PhoneSupport..