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41. According to the H. 323 standard, which of the following is a function of a gateway device?

A. Provide security to H. 323 systems.

B. Register IP endpoints.

C. Interconnect H. 323 systems to other systems.

D. Prevent Toll Fraud to the Public Switched Telephone Network (PSTN).

Answer: C   

42. Which of the following is an acceptable measurement for TOLL quality voice when testing for jitter between VoIP systems?

A. Less than 20ms

B. Less than 30ms

C. Less than 40ms

D. Less than 180ms

Answer: A   

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43. According to the H. 323 standard, which of the following are functions of a gatekeeper device?

A. Connection to the Public Switched Telephone Network (PSTN).

B. Admission control of IP endpoints to the domain.

C. Register and connect to remote H. 323 systems.

D. Prevent unauthorized legacy telephones from connecting to the system.

Answer: B   

44. At which of the following layers of the OSI model does RTP reside?

A. Session

B. Presentation

C. Application

D. Transport

Answer: C