Traditional Telephony
Here you will find answers to Traditional Telephony Questions
Question 1
Refer to the exhibit.
Which identifies the amplitude of an analog signal stream?
A. A
B. B
C. C
D. A & C
E. Voltage/Time
F. Voltage/Time x B/C
Answer: C
Question 2
Which three characteristics apply to ISDN PRI? (Choose three)
A. The D channel is 16 kbps
B. The D channel is 64 kbps
C. Can carry data, voice, or video
D. Cannot support call forwarding
E. Commonly used only in Europe
F. Can carry vendor-specific PBX features
Answer: B C F
Question 3
What are two benefits of using an ITSP for long distance telephony services? (Choose two)
A. Connection to an ITSP is very granular and can provision from 1 to hundreds of simultaneous calls.
B. Connection to an ITSP is only available in full T1/E1/PRI circuit quantities.
C. The circuits are dedicated only to voice.
D. Connection to an ITSP is easier to configure because transcoders can seamlessly convert H.323 or SIP to SCCP.
E. Connection to an ITSP allows you to use the bandwidth that is guaranteed to the voice traffic for data when voice is not using the bandwidth.
Answer: A E
Question 4
Which type of voice port will terminate a loop start or ground start line from the PSTN or a PBX?
A. L-FXO
B. FXS/FXO
C. PRI T1/E1
D. E&M
E. BRI
F. CAS T1/E1
Answer: B
Question 5
What device is responsible for converting analog voice packets from traditional voice formats to IP packets?
A. MGCP gateway
B. H.323 gateway
C. Media Termination Point
D. Digital signal processor
E. Transcoder
Answer: D
Question 6
Which four types of high-density trunk can be used to connect to an ITSP? (Choose four)
A. T1/E1 CAS
B. FXS
C. T1/E1 PRI
D. E&M
E. SIP
F. H.323
Answer: A B C D
Question 7
What are three functions provided by a switching system in a traditional telephony network? (Choose three)
A. Call setup
B. Call supervision
C. Quality of service
D. Codec processing
E. Voice compression
F. Customer IDs and telephone numbers
Answer: A B F
Question 8
An analog telephone is connected to a ________ port on a router?
A. FXO
B. E1
C. T1
D. FXS
Answer: D
Regarding de following question, do not understand why the answer isn’t the E and F options . Thanks for your help.
Which four types of high-density trunk can be used to connect to an ITSP? (Choose four)
A. T1/E1 CAS
B. FXS
C. T1/E1 PRI
D. E&M
E. SIP
F. H.323
Answer: A B C D
Because SIP and H.323 are protocols.
Thank for aswering, but if I want to connect with ITSP Wouldn’t it be thorugh a SIP or H.323 trunk? and if so, taking literally the word “trunk”, is FXS a trunk? shouldn’t it be FXO or FXS / FXO in this case?
Someone please make this clear.
Most Internet telephony service providers (ITSP) use SIP as their primary signaling protocol nowadays. It is just a normal connection (you can use FastEthernet or Giga Ethernet ports), not FXO/FXS ports.
Voicetut, with your last explination ist contradicting the answer for question #6 that Heron was asking about. An ITSP would not connect to a FXS port so why is that one of the correct answers to that question?
Q6= I think confusion of “connect to an ITSP?” still persists.
Question is asking for types of high-density trunks?
Here follows book defination.
“The ITSP trunks are typically SIP based but can also be H.323.
The call is sent to the ITSP through an IP connection, and the ITSP routes the call to the PSTN.”
So, I’d say correct answer is “A,C,E & F”.
Dear Friends
I wish you are in very good health ….. regarding Question 4, i think the correct answer is “F”
not “B” …. This because , i can using Loop start & Ground start signal with T1/E1 CAS to connect to either PBX or PSTN …….. But i can’t use FXS port to connect to PSTN ……
What is your opinion ??????
Because E&M trunk is not high density and FXS is used to connect to an Analogue ‘End-Point’ device. I would say answer should be: A,C,E & F are correct
Which four types of high-density trunk can be used to connect to an ITSP? (Choose four)
A. T1/E1 CAS
B. FXS
C. T1/E1 PRI
D. E&M
E. SIP
F. H.323
A,C,D,E ..because outside calls using VOIP, use SIP as their primary signaling protocol. TRUNK—SIP–ITSP.
E1 PRI—- 30 CHANNELS —–ITSP.
T1–24 CHANNELS —-ITSP
E&M—- ITSP
H.323 is an earlier voice gateway protocol and SIP (Session Initiation Protocol)
Hello Voicetut,
Can you please make some toturial for voice as 9tut did for CCNA? we will highly appreciat it.
@Adil: It takes a lot of time and effort to make such tutorials. But hopefully we can do it in the future.