642-432 - CVOICE - Cisco Voice Over IP Exam
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You are the network engineer at TestKing.com. You have configured real-time call control processing on the TestKingVoIPnetwork. You want to verify this configuration. What command should you use?
What is the key element in call admission control when interconnecting CallManager sites via the IP WAN?
Cisco is making every effort to ensure that the gateways, applications, and client produced integrate and operate seamlessly with third party products. From the list below, select which protocols are being used to ensure this effort.
All choices are correct.
Which device is used to allow an H.323 stream to transit a firewall?
You are the network technician at TestKing.com.VoIPis implemented on the TestKing network. Your newly appointed TestKing trainee wants to know what this implementation usesto carry the payload across the network. What will your reply be?
RTP inside UDP
Which of the following is the correct formula for encoding PCM?
4000 Hz frequency sampled at two times the frequency and each sample is represented in 8 bits = 64 kbps
A 9 digit number must be dialed to reach numbers on the PSTN. What process makes sure that the first digit 9 is not transmitted as part of the called number?
Which preference key word assigns top precedence to a dial peer in a hunt-group?
Which organization approved the H.323 standard?
Which statement is true about only out-of-band signaling?
Signaling bits are sent in a special order in a dedicated signaling frame.
Your manager asks you for a worksheet defining items that need to be addressed for the future VOIP and IP telephone rollout. What items do you put on the worksheet that need to be addresses for the wiring closets? (Choose all that apply.)
Switches with Inline Power
UPS systems and Backup power
Cooling Requirements (a heat profile)
What is true about H.323 endpoint call setup?
Endpoints can either do their own setup or be assisted by a gatekeeper.
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 ports 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?
You are the network engineer at TestKing.com. You are configuring a connection to a SIP proxy server. Which command would you use to specify the IP address of the server?
sip-ua sip-server ipv4:126.96.36.199
Which two tools are most appropriate for configuring 4,000 IP Phones prior to deploying the phones and allow phones to auto register? (Choose two.)?
Which characteristic is true about SIP protocol messages?
You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?
After the jitter buffer fills up, subsequent packets are discarded.
What does the Digit Discard Instruction of PreDot do to the pattern 9.2148134444?
change it to 2148134444 before presenting it to the PSTN Answer: D
In accordance with the G.114 standard, which of the following delay ranges is acceptable?
0 - 150 ms
You are the network technician at TestKing.com. Your newly appointed TestKing trainee wants to know which application conveys fax using T.37 fax relay. What will your reply be?
What is used to translate called (DNIS) and calling automatic number identification (ANI) numbers before routing the call?
What is a logical grouping of directory numbers (DN) and route patterns with similar reachability characteristics when working with IP Telephony?
Calls between IP and PBX users can use all of the features provided by each system, and that subset is defined by the level of complexity of the voice interface between the IP network and the PBX.
IP Telephony uses which protocol that does not accommodate re-transmission?
RTP (real time protocol)
You are the VoIP engineer at . A user complains that she gets a busy tone instead of a dial tone when she tries to call another user. You want to troubleshoot this problem. What command should you use?
show voice dsp
When impendence is mismatched in a two-wire to four-wire circuit, what is the common result?
Which statement is true about the MGCP call agent?
Provides only call signaling and call setup.
You have designed a complex dial plan using digit manipulation. Given the following snippet of your configuration file, what action would you expect to result when a call beginning with the digits "5501" is received? dial-peer voice 1 pots destination-pattern 5501... ... prefix port 1/0/0 PrometricVUE.com
A ten digit number beginning with 5501 will be forwarded.
When analyzing the WAN for IP Telephone deployment, you need to collect information from the WAN and LAN devices. You need to determine current Bandwidth usage before rolling out a solution. From the analysis you are performing, there are categories you can collect information from. Select two from the list below.
Device information, which includes router models, memory, CPU, interface card modules versions and software versions
The existing WAN topology, which includes logical design information and bandwidth subscription rates
Upon which protocol model is the SIP protocol based?
If a PC connected to an IP Phone is having trouble obtaining an IP address, which setting on the phone might help resolve the problem?
You are the network technician at . Your newly appointed trainee wants to knowwhich application conveys fax using T.37 fax relay. What will your reply be?
You have a customer that is interested in determining the number of VoIP calls their Frame Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth available outside all other applications and overhead. How many G.729 calls using the 8 kbps codec and 20 byte sample size can be supported?
Which type of delay is caused by the line speed of the interface?
You have all ten digits being sent to your CM from the PSTN (via a gateway). If you have four digit extensions, how do you make sure that the call gets routed?
configure the GW to only collect four digits
Which channel carries Q.931 signals in a T1 connection from a PBX to a Cisco gateway?
What are the three components in an MGCP environment? (Choose three.)
What is the major advantage of designing and placingVoIPand Internet telephony in a clients organization?
It avoids the tolls charged by ordinary telephone service
What will happen when a network link is oversubscribed?
All voice calls suffer.
You are the network engineer at . You are configuring a connection to a SIP proxy server. Which command would you use to specify the IP address of the server?
sip-ua sip-server ipv4:188.8.131.52
What will be the outcome of an incoming VoIP call arriving at CK2 from CK1 , given the following router configurations? CK1 Configuration dial-peer voice 1 pots destination-pattern 1111 port 1/0/0 CK2 Configuration dial-peer voice 1 pots destination-pattern 2222 port 1/0/0 ! dial-peer voice 2 voip destination-pattern 1111 session-targetipv4:172.16.1.1
The call setup will fail.
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?
You are the network technician at . VoIP is implemented on the network. Your newly appointed trainee wants to know what is used to carry VoIP voice packets on this network. What will your reply be?
You are the network engineer at . has been using the following dial peer codec command: Codec g729r8 You reconfigure the dial peers with the following command: Codec g729ar8 bytes 10 How will this reconfiguration affect the voice network bandwidth and delay characteristics? (Choose two.)
Delay will decrease on a per call basis.
Bandwidth consumption will increase on a per call basis.
What type of multiplexing is packet switching an example of?
You are the Voice technician at , Inc. You want to deploy an IP telephony solution for the company. The network is currently a traditional LAN/WAN based on Frame Relay. Your CEO has read about the issues of converging both data and voice traffic onto a single network. She is concerned about the quality of their calls that need to cross the WAN in particularly. What would you need to implement to ensure QoS for VoIP over Frame Relay?
Fragmentation, traffic shaping, priority queuing, Low Latency Queuing, and link efficiency with cRTP.
You are the Voice technician at . Your newly appointed trainee wants to knowwhat request method initiates a SIP call setup. What will your reply be?
You are the network engineer at . You are deploying an IP telephony solution using MGCP. The call agent expects the gateway to use UDP port 2427 but an application on the network is already using that port. You want to use port 4662 instead. Which command would allow you to change the UDP port that the call agents and gateway communicate on?
Router(config)# mgcp call-agent 4662
You are the network technician at . Your newly appointed trainee wants to know what factors affects audio quality. What will your reply be?
Echo and delay variation
What does gateway require to function as a translating gateway?
The ability to recognize the call control procedures of both connecting endpoints.