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    Mic/speaker module for IP cameras (dahua/hikvision)

    I am using ip cameras from dahua (Ipc-hdbw4300e-as) and hikvision (DS-2CD2132F-IWS), want to try out the two-way audio feature they support. However they only have audio in/out interface (dahua uses RCA, hikvision has some 4-pin plug). I figure it probably needs a powered speaker and a external...
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