5. From a ___ viewpoint, a firewall opens a single-port "pinholes" to allow different VoIP control signaling and active call connections to pass through.

A. Quality of Service

B. Bandwidth utilization

C. Network performance

D. Security

6. An example of privileges of an IP phone or an extension line could be___.

A. hours of operation

B. access to long-distance services

C. international calling

D. all of the above