Cvoice question 1

Which two codes together make up the number that follows the E.164 recommendation numbering scheme? (Choose two)

A. country code
B. subscriber code
C. national destination code
D. provider code

Answer: A B

Explanation

E.164 is an international numbering plan created by the International Telecommunication Union (ITU). Each number in the E.164 numbering plan
contains the following components:

Country code (CC)
National destination code (NDC - optional)
Subscriber number (SN)
The CC consists of one, two or three digits. It is what we add in order to access different countries and often prefixed with a +

The NDC is the code we often call the area code.

The SN is for telephone numbering. It is given by your phone operator.

E.164 numbers are limited to a maximum length of 15 digits.

For example, the North American Numbering Plan E.164 is as follows:

1-783-444-2222

+ 1: Country code
+ 783444: National destination code (for North American Numbering Plan, 783 is called the area code while 555 is called Central Office Code)
+ 2222: Subscribe Number

Answer C is also correct but just optional. E.164 Numbering Plan must have Country Code and Subscriber Code so A & B are the correct answers.

Cvoice question 2

Which statement is true about only out-of-band signaling?

A. A signaling bit is robbed from each frame.
B. Signaling bits are sent in a special order in a dedicated signaling frame.
C. All signaling is directly associated with its corresponding voice frame.
D. All voice packets carry their own signaling.

Answer: B

Explanation

Out-of-Band signaling is telecommunication signaling exchange of information in order to control a telephone call. Out-of-Band signaling uses common channel signaling (CCS), that means signaling information is transmitted using a separate, dedicated signaling channel.

Answers A C D are characteristics of Channel associated signaling (CAS) so they are not correct.

Cvoice question 3

The D channel in ISDN is an example of which two signaling methods? (Choose two.)

A. CCS signaling
B. out-of-band signaling
C. in-band signaling
D. CAS signaling

Answer: A B

Cvoice question 4

In North America, which E&M signaling type is used most often for geographically separated equipment?

A. Type I
B. Type II
C. Type III
D. Type IV
E. Type V

Answer: B

Explanation

This information is quoted from
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080093f60.shtml

E&M Type I - This is the most common interface in North America.

Type I uses two leads for supervisor signaling: E, and M.
During inactivity, the E-lead is open and the M-lead is connected to the ground.
The PBX (that acts as trunk circuit side) connects the M-lead to the battery in order to indicate the off-hook condition.
The Cisco router/gateway (signaling unit) connects the E-lead to the ground in order to indicate the off-hook condition.
E&M Type II - Two signaling nodes can be connected back-to-back.

Type II uses four leads for supervision signaling: E, M, SB, and SG.
During inactivity both the E-lead and M-lead are open.
The PBX (that acts as trunk circuit side) connects the M-lead to the signal battery (SB) lead connected to the battery of the signaling side in order to indicate the off-hook condition.
The Cisco router / gateway (signaling unit) connects the E-lead to the signal ground (SG) lead connected to the ground of the trunk circuit side in order to indicate the off-hook condition.
E&M Type III - This is not commonly used in modern systems.

Type III uses four leads for supervision signaling: E, M, SB, and SG.
During inactivity, the E-lead is open and the M-lead is set to the ground connected to the SG lead of the signaling side.
The PBX (that acts as trunk circuit side) disconnects the M-lead from the SG lead and connects it to the SB lead of the signaling side in order to indicate the off-hook condition.
The Cisco router / gateway (signaling unit) connects the E-lead to the ground in order to indicate the off-hook condition.
E&M Type IV - This is not supported by Cisco routers / gateways.

E&M Type V - Type V is symmetrical and allows two signaling nodes to be connected back-to-back. This is the most common interface type used outside of North America.

Type V uses two leads for supervisor signaling: E, and M.
During inactivity the E-lead and M-lead are open.
The PBX ( that acts as trunk circuit side) connects the M-lead to the ground in order to indicate the off-hook condition.
The Cisco router / gateway (signaling unit) connects the E-lead to the ground in order to indicate off-hook condition.
Although above information specifies E&M Type 1 is the most commonly used interface in North America but this type generates significant delay in the signaling operation when transmitting between geographically separated equipment and affects voice signal quality (because of significant inductance and capacitance of the long wires) so Type 2 is often used instead.

Cvoice question 5

Which three are supervisory signals? (Choose three)

A. busy
B. on hook
C. off hook
D. call waiting
E. ring

Answer: B C E

Cvoice question 6

What is the approximate frequency range of human speech?

A. 20 Hz to 20,000 Hz
B. 40 Hz to 15,000 Hz
C. 200 Hz to 9000 Hz
D. 600 Hz to 5400 Hz

Answer: C

Cvoice question 7

What is the process of assigning audio amplitude to a unique digital code word?

A. linear prediction
B. encoding
C. sampling
D. quantization

Answer: D

Cvoice question 8

What is the E.164 standard?

A. private numbering plan
B. national numbering plan
C. dial plan
D. international public telecommunications numbering plan

Answer: D

Cvoice question 9

For the following items, which is the most common E&M type used outside North America?

A. Type IV
B. Type I
C. Type II
D. Type III
E. Type V

Answer: E

Cvoice question 10

A new business in France needs to have a PSTN connection that will handle a maximum of 30 inbound and outbound calls at any given time. The customer only has one slot available on the designated PSTN router. Which digital line type will you recommend?

A. ISDN T1 PRI
B. QSIG
C. ISDN E1 PRI
D. ISDN BRI

Answer: C

Cvoice question 11

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

Cvoice question 12

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

Cvoice question 13

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

Cvoice question 14

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

Cvoice question 15

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

Cvoice question 16

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

Cvoice question 17

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

Cvoice question 18

An analog telephone is connected to a ________ port on a router?

A. FXO
B. El
C. T1
D. FXS

Answer: D

Cvoice question 19

In which of the following scenarios would a Cisco switch supply PoE to an IP phone?

A. In any cases as long as the switch and IP phone are Cisco products.
B. If the Cisco switch supports prestandard PoE and the IP phone supports 802.3af.
C. If the Cisco switch and IP phone both support a common PoE method.
D. Only if both the switch and IP phone use 802.3af PoE.



Answer: C

Cvoice question 20

What protocol does a Cisco IP phone use to indicate to the switch how much power is needed?

A. PoE
B. CDP
C. VTP
D. cRTP



Answer: B