Grandstream HT802 Quits Responding - Zombie Mode

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The Grandstream HT802 quits presenting MAC address to network and fails to change LED Status when cable disconnected.
This occurs after a random amount of time on all versions, we have many ATAs that do this, and many that don’t. They started doing this after a PBX update. So the suspicion is this is software related, but the issue is consistent across not 1.0.8.2, but 1.0.9, 1.0.10, through 1.0.21.4.
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Did you solve, probably a bad firmware install or a corrupted firm install

uniteddrones
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I thought this ATA device could work wirelessly from the modem?

laheart
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When the ATA keeps pulling setting updates, it eventually fails. The answer is to make sure the provisioned config disables the ATA from looking for further updates via settings it receives from DHCP.

aerickson