Your customer would like to allow call attempts only from User Agents (UAs) who have previously registered through the Session Border Controller or who are configured as session agents.
How would you accomplish this?
A.
Navigate to the sip-port configuration element and set the allow-anonymous parameter to agents-only.
B.
Navigate to the session-agent configuration element and set the allow-anonymous parameter to prev-registered.
C.
Navigate to the sip-port configuration element and set the allow-anonymous parameter to realm-prefix.
D.
Navigate to the sip-port configuration element and set the allow-anonymous parameter to registered.
E.
Navigate to the session-agent configuration element and set the allow-anonymous parameter to 403-forbidden.
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