Ways to receive calls from address book on Cisco Telepresence SX20?

I got many unknown calls on my teleconferencing equipment and I would like to know if there are ways to block these calls or even perhaps only to receive calls on the address book.

This has been discussed before in the forums many times more.  Take a look at some of the following threads:

If your endpoint has a public IP address, depending on the configuration of endpoint, you could get behind a NAT device or restrict access of your firewall to allow only specific IP addresses this conference you with.  If you use H323, you must also disable SIP endpoint.

Tags: Cisco Support

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