How To Add Audio To An IPC?

HI.

I have a client who has 27 pieces of IPC-HDW1100 connected to NVR 4432 using POE Switch and Cat6 Cable.

Now he wants to add audio in all the IPC.

What would i require to make audio work with the current setup.

Thanks.

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IPC-HDW1000S Audio Spec

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NVR4408/4416/4432 Audio Spec

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