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Blacklisting IP address automatically for Yealink Phones

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We trying a site with 30 extensions. All are programmed with Yealink phones. All phones are provisioned. The Vodia system (66.0.6) is in our data center, and the phones are remote at one facility. Just today, all the phones went offline. I traced it down that the IP was blacklisted automatically in the Access. I am certain that we did not go over the threshold. This is the second time this happens after the IP changed.

Number of tolerated attempts: 10
Time for counting attempts: 1s
Blacklist Duration: 1h
Connection per address without authentication: 10

We cannot whitelist the IP because we cannot get a static IP address. But I'm also worried that it can happen in the future.


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