... the antenna sensitivity, and other environmental factors.Key FeaturesOpen Standard VoIP Protocols (IETF SIP V2) Two 10/100 Ethernet for ... LEDs for Power, Ready, Status, WAN, PC, FXS Call Forward, Call Hold, Call Transfer Dial Plan Caller ID Enhanced FeaturesDynamic selection of ... Mechanism draft-ietf-sipping-cc-transfer-04 – Session Initiation Protocol Call Control - Transfer Codec: G.711 (A/µ law), G ...