02/18/2020 TDC 364 HW-Extra 1 of 8
Homework 10
1. What is the codec schmes used in the TDC364 lab?
a. G.711 and G.729A
b. G.711 and G.723.1
c. G.711 and G.726
d. G.711 and iLBC
2. The X-lite software used in the TDC364 VoIP lab is _______
a. User Agent Client (UAC) only, no UAS
b. User Age...
02182020 tdc 364 hw extra 1 of 8 homework 10 1 what is the codec schmes used in the tdc364 lab a g711 and g729a b g711 and g7231 c g711 and g726 d g711 a
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Homework 10
1. What is the codec schmes used in the TDC364 lab?
a. G.711 and G.729A
b. G.711 and G.723.1
c. G.711 and G.726
d. G.711 and iLBC
2. The X-lite software used in the TDC364 VoIP lab is _______
a. User Agent Client (UAC) only, no UAS
b. User Agent Server (UAS) only, no UAC
c. Both UAC and UAS
d. SIP Prosxy server
3. What is the SIP proxy server for the TDC364 lab?
a. Aserisk
b. Xlite
c. Google Talk
d. SkyPE
4. In the FreePBX setting, what is the directory that contians the SIP configuration files?
a. /etc/freepbx
b. /etc/asterisk
c. /var/log/aserisk
d. /etc/voip
5. What is the security tool on FreePBX to protect hacker intrusion?
a. IPFIX
b. Checkpoing
c. Fail2ban
d. Guardian
6. Which of the follow SIP message is used for event notification?
a. MESSAGE
b. NOTIFY
c. REGISTER
d. INVITE
7. Which of the follow SIP message is to support instant messaging service?
a. MESSAGE
b. NOTIFY
c. REGISTER
d. SUBSCRIBE
8. Which of the following SIP messages are used to support Presence Service?
a. INVITE and 200 OK
b. REGISTER and 200 OK
c. SUBSCRIBE and NOTIFY
d. MESSAGE and ACK
9. Which of the following SIP message could be acknowledged by PRACK?
a. INVITE
b. 180 Ringing
c. 100 OK
d. ACK
10. Which of the following SIP message is to support call on-hold?
a. INVITE
02/18/2020
This study source was TDC 364
downloaded by 100000843226607 from CourseHero.com HW-Extra
on 03-19-2022 15:19:11 GMT -05:00 1 of 8
11. Which of the following SIP message is used by the Proxy server to alert the voice mail server of
incoming calls?
a. MESSAGE
b. NOTIFY
c. SETUP
d. INVITE
12. In the SIP-based VoIP network, how does a user subscribe to the Voice Mail service?
a. The user sends the SUBSCRIBE message to the Voice Mail serer.
b. The user sends the SUBSCRIBE message to the Proxy server.
c. The Voice Mail server sends the SUBSCRIBE message (with user info) to the Proxy server.
d. The Voice Mail server sends the REGISTER message (with user info) to the Proxy server.
13. Which of the following network element is required for Call Center Service?
a. Key System
b. IAD
c. ACD
d. Modem
14. Which of the following service is used by Call Center to automatically (no human agent) interact with
incoming caller?
a. AA
b. ACD
c. SDN
d. Codec
1. (7 pt) Based on the lab work, what is the bandwidth (data rate) of ILBC?
a. Time Interval
Start time stamp
End time stamp
Time interval (sec) ~ 1.0 seconds
b. Number of RTP Packets
Sequence number of 1st RTP
Sequence number of the last RTP
Number of RTP packets (two-way) ~66 packets
Number of RTP packets (one-way) ~33 packets
c. Number of RTP packets in one second: 33 packets/sec
d. Voice payload size: 50 bytes
e. Bandwidth (data rate in bps): 13.2 kbps
2. (5 pt) The following is a wireshark screenshot of a VoIP call. Use the screenshot to answer the
questions below.
02/18/2020
This study source was TDC 364
downloaded by 100000843226607 from CourseHero.com HW-Extra
on 03-19-2022 15:19:11 GMT -05:00 2 of 8
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