Patent ID: 8750317

Claim:
A data monitoring system for monitoring data including at least one of voice data and image data, said data monitoring system comprising: a first network, to which a first communication apparatus is connected; a second network, to which a second communication apparatus is connected, and uses a communication protocol different from a communication protocol used by said first network; and a data monitoring apparatus, to which a monitoring terminal is connected, including: a call processing circuit to retrieve decoding information, required for decoding said data, from a call processing signal transmitted from said first communication apparatus to said second communication apparatus and from said second communication apparatus to said first communication apparatus, and to transmit said decoding information to said monitoring terminal; and a data processing circuit to convert a format of data, transmitted from said first communication apparatus, into a format of said second communication apparatus, or to convert a format of data transmitted from said second communication apparatus into a format of said first communication apparatus, on a basis of said decoding information, wherein data from at least one of said first communication apparatus and said second communication apparatus, a format of said data from at least one of said first communication apparatus and said second communication apparatus has not been converted, is copied and transferred to said monitoring terminal, which includes a decoding circuit to decode said data in accordance with said decoding information, wherein if, during monitoring, degradation of the quality of the data is detected, the degraded portion of the data is sliced out, and wherein said data monitoring apparatus is arranged on a transmission path of said voice data or said image data between said first network and said second network.