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Mr. Gregory White
Mr. Gregory White, Professor
Category: Homework
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Experience:  M.A., M.S. Education / Educational Administration
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TCO 5) ABC Inc. replaced its legacy circuit-switched PBX

Customer Question

TCO 5) ABC Inc. replaced its legacy circuit-switched PBX with an SIP-based VoIP system on its Ethernet LAN. When capturing and observing voice packets (i.e., RTP packets) using Wireshark, what are the OSI layer 2, OSI layer 3, and OSI layer 4 headers of each packet? Justify, in one paragraph, why the packets’ OSI layer 4 protocol, and not its alternative, is chosen.
(TCO 5) The IT department of ABC Inc. is looking into reducing the required bandwidth per VoIP conversation to save on WAN link expenses. Explain, in one paragraph, how cRTP can help it achieve this goal. How effective is silence suppression (i.e., VAD) in reducing total required bandwidth on the WAN link?
(TCO 6) What’s the H.323 terminology for an SIP server (or VoIP server)? Describe, in one paragraph, two tasks for which an IP phone needs to communicate with an SIP server.
(TCO 9) Use the Erlangs and VoIP Bandwidth Calculator at to complete the following question.
ABC Inc. is planning to lease a 512 Kbps frame relay connection between two PBXs from two branch locations. On the connection, 120 call attempts with an average call duration of 10 minutes during the Busy Hour were observed. What’s the traffic volume/load in Erlangs on this trunk connection?
The audio codec used on the trunk is G.729A with a 20-millisecond packet duration. What’s the call blocking probability, in percentage, achieved on this trunk? Is such calling blocking probability acceptable, given the 1-5% norm in the industry?
(TCO 11) Describe, in four paragraphs, the International Telecommunication Union’s rule for various tiers of voice transmission end-to-end latency (i.e., 150 milliseconds, 200 milliseconds, above 250 milliseconds, and above 500 milliseconds)
Submitted: 1 year ago.
Category: Homework
Customer: replied 1 year ago.
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Expert:  Mr. Gregory White replied 1 year ago.

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