略語大辞典 [C] 25 IEC-Q ISDN(integrated services digital network) Echo Cancellation Circuit 統合サービスディジタル(通信)網(ISDN)エコー消去回路.ISDN(integrated services digital network) Echo Cancellation Circuit; [C:Opt]. 丸善「略語大辞典」JLogosID : 11878102