Hiya guys. The mic/speaker combo is 12vdc powered. BUT I have no luck with trying to pass audio to/fro using the camera. I used my PC linein and software and was able, using the PCM codec, to produce a clear and responsive message so it is not the combo speaker/mic. I tried all the cable combination I could come up with and finally I got it to work by leaving 3/8" of the 3.5mm mono barrel plug out of the jack. Once inserted all the way in it does short out the signal. After many convesation with BHPhoto and Hikvision support I finally sent the camera back for a refund. They need to fix this problem but I got a feeling that they have a lot of cameras out with that same physical jacks/plugs. Never got to try the two way speaker as I ran out of fingers.
I did take a video of the problem and sent it to them but no response yet.
Let see. Bought the 7608 NVR and it took 2 weeks to get my HDD. After 3 weeks of dropping frames and cut outs with my 1st camera- a DS-2CD2785G0-IZS - I had to send that one back for repairs. I tried to reset it (using reset button) and it wasn't there. Took the camera apart and it was wedged in the electronics. Still waiting for that return. BTW this one came from straight from Nikvision as BHPhoto did not have it stock. I even took pictures of the packaging when it arrived as it was beat all to hell.
And to top it off, my HDD (4G Purple) crapped out after only 6 weeks. Initializing/format, it hangs up at 90%. Waiting on a RMA from Western Digital.
SO ever really got to configure/try off this system because of all the problems but in the week it worked correctly, I believe this system will work.