920-804 Real Exam Prep DEMO

Question 3: A company requests that their VoIP network be assessed to determine if some changes can be made
to alleviate bandwidth limitations. Given the following network information: ?The CODEC is G.711. ?Voice
Activity Detection (VAD) is NOT being used. ?The company wants to keep the bandwidth usage on its
Frame Relay (T1/E1 and T3/E3) circuits less than 50% of the overall bandwidth. ?The company will allow
the quality of the intelligible voice to degrade slightly in favor of a significant increase in total number of
calls possible on their circuits. ?They will NOT accept additional packetization delay since their network
is already at the maximum limit of acceptable delay (maximum delay budget) between the Internet
Telephones and the call server. Which configuration change will increase the number of VoIP calls
possible on the company's Frame Relay circuits?
A. Increase the packetization rate from 20 milliseconds to 30 milliseconds and decrease the jitter buffer.
B. Increase the packetization rate from 20 milliseconds to 30 milliseconds to gain approximately 20%
more calls.
C. Change the CODEC to G.729 with the same packetization factor of 20 milliseconds to more than
double the possible calls on the Frame Relay circuits.
D. There is NO way to increase the number of calls possible within the bandwidth restrictions unless they
are willing to re-engineer their network with a larger-bandwidth circuits.
Correct Answer: C