Category: IP Communications
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QUESTION 191
In a VoIP environment when speech samples are framed every 20 ms. a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deploued without redundancy checks?
Actualtests.com – The Power of Knowing 642-436
A. 1 byte
B. 2 bytes
C. 3 bytes
D. 4 bytes
E. 20 bytes
F. 40 bytes
Correct Answer: B Section: (none) Explanation
QUESTION 192
What does the PBX use to determine the destination of a call?
A. An ISDN ANI packet
B. A blocked/permitted call list
C. An analysis of the dialled digits
D. Historic requests from the specific phone extension
Correct Answer: C Section: (none) Explanation
QUESTION 193
Which of the following are CS-ACELP coding schemes? (Choose two)
A. G.711
B. G.728
C. G.729
D. Q.931
E. G-729A
Correct Answer: CE Section: (none) Explanation
QUESTION 194
Which of the following is the worst-case compression delay for CD-ACELP?
A. 2.5 ms
B. 5 ms
C. 7.5ms
D. 10 ms
E. 20 ms
Correct Answer: E Section: (none) Explanation
QUESTION 195
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What type of connection is considered a call leg?
A. A digital connection
B. A virtual connection
C. A logical connection
D. A physical connection
E. A hardwired connection
Correct Answer: C Section: (none) Explanation
QUESTION 196
To which layer of the OSI model does Q.921 signaling equatesto in ISDN?
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QUESTION 157
What is true about H.323 endpoint call setup?
A. Endpoints always do their own call setup.
B. Endpoints require a gatekeeper to do call setup.
C. Endpoints can either do their own setup or be assisted by a gatekeeper.
D. Endpoints require a proxy server to do call setup.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: A gatekeeper is an H.323 entity on the network that provides services such as address translation and network access control for H.323 terminals, gateways, and MCUs. Also, they can provide other services such as bandwidth management, accounting, and dial plans that can be centralized to provide salability. Gatekeepers are logically separated from H.323 endpoints such as terminals and
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gateways. They are optional in an H.323 network, but if a gatekeeper is present, endpoints must use the services provided.
QUESTION 158
Examine the example output hostname GW1 ! interface Ethernet 0/0 ip address 172.16.2.1 255.255.255.0 h323-gateway voip interface h323-gateway voip id GK1-zone1 .abc.com abc.com ipaddr 172.16.2.2 h323-gateway voip h323-id GW1 h323-gateway voip bind srcaddr 172.16.2.1 ! dial-peer voice 1 voip destination-pattern 12.12… … . session-target ras ! dial-peer voice 2 pots destination-pattern 2125551212 no register e164 ! end Choose the command that will restore communication with gatekeeper functionality to this device.
A. h323-gateway voip h323-id GK1
B. gateway
C. h323-gateway voip bind srcaddr 172.16.2.2
D. h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1
Correct Answer: B Section: (none) Explanation
QUESTION 159
What does a gateway router match to a dialed number when setting up a VoIP call?
A. IP route
B. Destination pattern
C. Call leg
D. Session target
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
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The router selects a dial peer for a call leg by matching the string that is defined by using the answer-address, destination-pattern, or incoming called-number command in the dial peer configuration.
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QUESTION 113
What from the list below combines voice mail, e-mail, and fax into a single application suite where a single application can be used to store and retrieve entire suite of message types?
A. PBSX Listing
B. Name Resolution IPTC
C. Call Manager 3.01
D. Cat 4000 STP v3
E. Unified messaging
Correct Answer: E Section: (none) Explanation
QUESTION 114
In a distributed call processing model, which three are located at each site? (Choose three.)
A. gatekeeper
B. voice messaging
C. media resources
D. Cisco CallManager cluster
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
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QUESTION 115
What can be used not only to restrict dialing, but also to identify a subset of a subset of a wildcard pattern (when using the @ wildcard in the North American Dialing Plan)?
A. An IS sheet
B. A ACL
C. A Route Filter
D. A DN top
Correct Answer: C Section: (none) Explanation QUESTION 116
What does the Digit Discard Instruction of PreDot do to the pattern 9.2148134444?
A. prefix a 9 before the “-” if none is dialled
B. discard 2148134444 and send the 9 access code
C. only collect the first four digits counting right to left.
D. change it to 2148134444 before presenting it to the PSTN
Correct Answer: D Section: (none) Explanation
QUESTION 117
What is the key element in call admission control when interconnecting CallManager sitesvia the IP WAN?
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