Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 237)

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User's Manual - 237
To enable Multicasting on a camera:
1. Enter Settings > Device > Cameras.
2. Single-click to select a camera for which you want to enable the Multicasting.
3. Click to select the Multicast tab.
4. Click the Multicasting slide button.
5. Click the Apply button.