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SIP line access concepts

You can protect the SIP line against denial of server (DoS) attacks. A DoS attack occurs when a website or other resource is overwhelmed is intentionally overwhelmed with bogus requests for service. As a result, legitimate customers are deprived of the services that the resource provides.

To protect the SIP line, you enter the SIP address restrictions by doing either of the following:

Grant Access to all computers and then enter the exceptions for the computers to which you want to deny access.
Deny Access to all computers, and then enter the exceptions for the computers to which you want to grant access.