Do Hikvision Lower Level NVRs (4 Or 8 Channel) Support Recording Audio Via The Ethernet?

Do Hikvision lower level NVRs (4 or 8 Channel) support recording audio via the ethernet? I know some of the NVRs have a dedicated audio line in. But I would be looking to record 4 cameras.

On that note, do any of the Hikvision cameras support audio via the ethernet rather then a line out?

Thanks

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