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Can an external number be added to the blacklist of the U1980?

Yes. You can add external numbers to the system blacklist or personal blacklist.

Other related questions:

Whether the USG2000&5000 series supports adding a network segment to a blacklist entry

You can add only one IP address at a time in the configuration of the blacklist entry on the USG2000&5000 series. To add multiple IP addresses, add them in multiple times.

How to check whether the IP Address of the user is passively added to the Blacklist of the Firewall?

In CLI mode, run the display firewall blacklist item command to view the blacklist of the firewall, and check whether the IP address of the user is on the blacklist. If the IP address of the user is on the blacklist, the firewall directly discards all packets of this user. If the corresponding blacklist entry exists, run the undo firewall blacklist item command to delete the blacklist entry.

How Many Subscriptions Can Be Added to a Topic?

A topic supports a maximum of 10,000 subscriptions.

How many entries can be configured in the system blacklist and whitelist?

The maximum number of entries that can be configured in the system blacklist and whitelist is half of the maximum number of users supported by U1900 series. U1981: 10000 U1980: 5000 U1960: 500 U1930: 300 U1911: 50 U1910: 50

Can an external number be used to create a conference on the U1900?

Only intra-office users can create conferences.

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Can an external number be added to the blacklist of the U1980?

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