Block Calls from Unknown IP Addresses

Make sure that the device accepts incoming calls only from source IP addresses that appear in the Proxy Sets or Tel-to-IP Routing tables. In addition, if an FQDN appears in these tables, the call is accepted only if the resolved DNS IP address of the call appears in any one of these tables. The device rejects calls whose source IP addresses don't appear in these tables. This is useful in preventing unwanted SIP calls, SIP messages, or VoIP spam.

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To block calls from unknown IP addresses:

1.

Open the Gateway Advanced Settings page (Setup menu > Signaling & Media tab > Gateway folder > Gateway Advanced Settings).

2.

From the 'IP Security' drop-down list, select Secure All calls:

Allowing Calls only from Configured IP Addresses