DrayTek Vigor 2820/30 - Downgrade Firmware (VoIP Issues)
image coming soon 150 If you are having issues using VoIP whilst using the DrayTek Vigor 2820 or 2830 you may need to downgrade the firmware. There is a known issue with this model in regards to registration attempts failing. This guide shows where to download the firmware, which version you require, and how to apply it to your DrayTek router.

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