8. Which of the following is a typical function of an H.323 gatekeeper?

A. End point (e.g., an IP phone) registration

B. Bandwidtj usage tracking

C. Billing

D. All of the above

9. In H.323 call signaling, which protocol is used for terminals to exchange capabilities and preferences such as audio and video codecs during a call setup?

A. H.225

B. H.245

C. SIP

D. RTCP

10. In the context of SIP architecture, a gateway translates____.

A. between RTP packets and PSTN voice bit streams

B. between SIP signaling and SS7 signaling on tbe PSTN.

C. between SIP signaling and H.323 signaling.

D. All of the above