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Exam : Cisco 642-432
Title : Cisco(r) Voice Over IP


1. 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

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. 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

4. 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

5. Examine the example output.
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

6. 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

7. Examine the output.
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. 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