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TestInside 642-432

Cisco Voice Over IP : 642-432 Exam
Exam Number/Code: 642-432
Exam Name: Cisco Voice Over IP
Questions and Answers: 72 Q&As
Price: $79.00
Update Time: 2008-6-5

“Cisco Voice Over IP”, also known as 642-432 exam, is a Cisco certification.
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1. A customer would like to be able to retire their existing permanent PSTN trunk connection between their PBXs and migrate to permanent connections over the IP WAN. There is one configuration statement missing from each router in the figure. What are the two missing statements?
(Choose two.)

A. connection tie-line e&m
B. connection trunk 4045551200
C. connection tie-line 2015551000
D. connection trunk 2015551000
E. connection tie-line 4045551200
F. connection tie-line

Answer:BD

2.In T1 CAS, where are the signaling states and control features carried for Super Frame robbed-bit signaling?
A. 6th and 12th frame
B. 6th, 12th, 18th, and 24th frame
C. the first and seventeenth time slot
D. the first and sixteenth time slot

Answer:A

3.You are meeting with a customer that has deployed IP telephony at their headquarters location.
They would like to roll out IP telephony to their regional office as well. They are now using the G.711 codec at headquarters. They want to be able to maximize the number of calls carried without impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their WAN?
A. G.726
B. G.723.1
C. G.711
D. G.729B Answer:D

4.You have been forwarded some questions by a prospective VoIP customer who would like to know the Cisco default sample size for the G.729 codec. What is it?
A. 40 ms B. 30 ms C. 20 ms D. 10 ms

Answer:C

5.Examine the following PBX system parameters:
The calling side seizes the line by going off-hook on its E-lead and sends information as DTMF
digits.
The voice path is 4-wires, and the voice enabled router is in another building from the PBX.
Select the correct set of commands to allow communication between a voice enabled router and a
PBX.
A. voice port 1/0/0
signal immediate-start operation 4-wire
type 2
B. voice-port 1/0/0 signal delay-dial operation 4-wire type 1
C. voice port 1/0/0 signal wink-start operation 4-wire type 3
D. voice port 1/0/0
signal immediate-start

operation 4-wire type 4

Answer:A

6.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 1212……. 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

Answer:B

7.Examine the output. ccm-manager mgcp
!
mgcp 5036
!
voice-port 1/0/0
!
voice-port 1/0/1
!
dial-peer voice 1 pots application MGCPAPP port 1/0/0

!
dial-peer voice 2 pots application MGCPAPP port 1/0/1
!

Your customer has sent you their MGCP gateway configuration. They are unable to get the gateway
to communicate with the call agent. What command needs to be inserted to resolve the problem?
A. ccm-manager mgcp 172.16.1.1
B. mgcp call-agent 172.16.1.1
C. application MGCPAPP 172.16.1.1
D. mgcp 5036 172.16.1.1

Answer:B

8. lick and drag the SIP network characteristic on the left to the type of SIP call setup it best describes.

UA cannot establish its own sessions

Direct Call Setup

UA must keep data on large number of destinations

Relies on cached information to resolve addresses

Server reports back to UA with destination coordinates

Proxy Server Call Setup

All setup messages go through server

Redirect Server Setup

9.Which command parameter specifies that the router should not attempt to initiate a trunk
connection but should wait for an incoming call before establishing the trunk? A. codec clear-channel
B. connection-trunk 404555…. answer-mode
C. voice-port 1/0:1
D. ds0-group timeslots 1-23 type ext-sig

Answer:B

10.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 deployed without redundancy checks? A. 1 byte
B. 2 bytes C. 3 bytes D. 4 bytes E. 20 bytes F. 40 bytes

Answer:B

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