CCVP IP Telephony Troubleshooting : 642-425 Exam

642-425 IPTT
IP Telephony Troubleshooting Exam

Last day to test 10/02/07
Exam Number: 642-425
Associated Certifications: CCVP, and IP Telephony Operations Specialist
Duration: 90 minutes (50-60 questions)
Available Languages: English
Click Here to Register: Pearson VUE
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The Cisco IP Telephony Troubleshooting exam will certify that the successful candidate has important knowledge and skills necessary to troubleshoot Enterprise CallManager, Unity, and IP network deployments. The IP Telephony Troubleshooting exam is one of two exams in a curriculum that addresses both design/planning practices and hands-on experience in configuring, deploying, and troubleshooting AVVID solutions.

Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam.

Describe effective troubleshooting methods to resolve issues in complex IP Telephony networks
Identify general converged network problems and issues
Perform a baseline analysis and document existing infrastructure using Cisco recommended methodologies
Create a troubleshooting strategy that follows Cisco recommended methodologies
Use Cisco TAC as a troubleshooting and escalation tool

Troubleshoot common CallManager configuration, integration and operations problems
Troubleshoot common call setup problems with both voice and video calls
Troubleshoot complex CallManager problems using system trace files
Troubleshoot and resolve Cisco CallManager dial-plan issues including CSS, Partitions, and translation patterns
Troubleshoot and resolve problems with media resources including MOH and conferencing
Identify CTI components and troubleshoot problems related to CTI

Troubleshoot Cisco AVVID and server components using the appropriate utilities and management tools
Demonstrate the use of the Cisco CallManager Serviceability tools to troubleshoot IPT problems

Troubleshoot common router, switch and gateway configuration, integration and operation issues and problems
Determine the effect of Layer 2 configuration errors on an IPT network operation
Determine the effect of Layer 3 configuration errors on an IPT network operation
Troubleshoot and resolve problems with Gateway operation

Use appropriate troubleshooting methods to determine and solve QoS issues in complex IP Telephony networks
Determine the QoS policies in effect in an established network
Describe the various QoS methods available and their effect on network traffic flows
Identify common problems associated with voice echo

Troubleshoot common Unity configuration, integration and operation issues and problems
Troubleshoot and resolve message delivery problems
Describe disaster recovery tools
Troubleshoot and resolve MWI problems
Troubleshoot and resolve Voice Mail port problems

Exam Number/Code: 642-425
Exam Name:CCVP IP Telephony Troubleshooting

“CCVP IP Telephony Troubleshooting”, also known as 642-425 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 54 Q&As to your 642-425 Exam preparation. In the 642-425 exam resources, you will cover every field and category in CCVP helping to ready you for your successful Cisco Certification.
Free Demo DownloadActualtests offers free demo for 642-425 exam (CCVP IP Telephony Troubleshooting). You can check out the interface, question quality and usability of our practice exams before you decide to buy it.

Exam DetailsThe Cisco IP Telephony Troubleshooting exam will certify that the successful candidate has important knowledge and skills necessary to troubleshoot Enterprise CallManager, Unity, and IP network deployments. The IP Telephony Troubleshooting exam is one of two exams in a curriculum that addresses both design/planning practices and hands-on experience in configuring, deploying, and troubleshooting AVVID solutions.

QUESTION 11:
You have received a trouble ticket for a recently installed MGCP gateway. It
appears that under testing the gateway, it is not switching to the secondary call
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agent when the primary call agent is unreachable. Use the following configuration
output to resolve the problem:
!
mgcp
mgcp call-agent 10.1.44.4 2427 service-type mgcp version 1.0
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voice mode cisco
mgcp sdp simple mgcp package-capability rtp-package
mgcp package-capability sst-packateno mgcp timer receive-rtcp
no mgcp explicit hookstate
!
ccm-manager mgcp
ccm-manager config server 10.1.44.7
ccm-manager config
!
What command needs to be added to this configuration to allow the MGCP gateway
to use a different call agent if the primary fails?
A. ccm-manager fallback-mgcp
B. ccm-manager switchback
C. ccm-manager switchover-to-backup
D. ccm-manager redundant-host
Answer: D
ccm-manager redundant-host
To configure the IP address or the Domain Name System (DNS) name of one or two
backup CiscoCallManager servers, use the ccm-manager redundant-host command in
global configuration mode. To disable the use of backup Cisco CallManager servers as
call agents, use the no form of this command.
ccm-manager redundant-host {ip-address | dns-name} [ip-address | dns-name]
no ccm-manager redundant-host {ip-address | dns-name} [ip-address | dns-name]
Syntax Description
ip-address IP address of the backup
CiscoCallManager server.
dns-name
DNS name of the backup
CiscoCallManager server.
Defaults
If you do not configure a backup CiscoCallManager, the redundancy is disabled.
Command Modes
Global configuration
Command History
Release Modification
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12.1(3)T This command was introduced with
CiscoCallManager Version3.0 and the
CiscoVoiceGateway200 (VG200).
12.2(2)XA The command was implemented on
Cisco2600 series and Cisco3600 series.
The _DNS-name argument was added.
12.2(4)T
The command was integrated into Cisco
IOS Release 12.2(4)T.
12.2(2)XN Support for enhanced MGCP voice
gateway interoperability was added to
Cisco CallManager Version3.1 for the
Cisco2600 series, 3600 series, and the
CiscoVG200.
12.2(11)T This command was integrated into the
Cisco IOS Release 12.2(11)T and Cisco
CallManager Version 3.2 and
implemented on the Cisco IAD2420
series routers.
Usage Guidelines
You can configure one or two backup CiscoCallManager servers. The list of IP addresses
or DNS names is an ordered and prioritized list. The CiscoCallManager server that was
defined with the mgcp call-agent command has the highest priority (that is, it is the
primary CiscoCallManager server). The gateway selects a CiscoCallManager server on
the basis of the order of its appearance in this list.
Examples
In the following example, the IP address of the backup CiscoCallManager is 10.0.0.50:
ccm-manager redundant-host 10.0.0.50

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122tcr/122tvr/vrg_c2.htm#wp1095

7
QUESTION 12:
Following is a partial configuration of an access layer switch:
mls qos map cos-dscp 0 8 12 16 28 32 40 46
mls qos
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
wrr-queue cos-map 1 6 7
wrr-queue cos-map 2 5
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wrr-queue cos-map 3 2 3 4
wrr-queue cos-map 4 0 1
spanning-tree portfast
!
interface FastEthernet0/2
switchport access vlan 20
switchport trunk encapsulation dot1q
switchport mode dynamic desirable
switchport voice vlan 20
no ip address
mls qos trust device cisco-phone
mls qos trust cos
wrr-queue cos-map 1 6 7
wrr-queue cos-map 2 5
wrr-queue cos-map 3 2 3 4
wrr-queue cos-map 4 0 1
spanning-tree portfast
!
Voice bearer traffic is mapped to which queue in FastEthernet0/2?
A. Queue 1
B. Queue 2
C. Queue 3
D. Queue 4
Answer: B
wrr-queue cos-map
Use the wrr-queue cos-map global configuration command to assign class of service (CoS) values to the
CoS priority queues. Use the no form of this command to return to the default settings.
wrr-queue cos-map quid cos1…cosn
no wrr-queue cos-map [queue-id [cos1 ... cosn]]
Command Modes Global configuration
Usage Guidelines CoS assigned at the ingress port is used to select a CoS priority at the egress port.
Examples This example shows how to map CoS values 0, 1, and 2 to CoS priority queue 1, value 3 to CoS
priority
queue 2, values 4 and 5 to CoS priority 3, and values 6 and 7 to CoS priority queue 4:
Switch(config)# wrr-queue cos-map 1 0 1 2
Switch(config)# wrr-queue cos-map 2 3
Switch(config)# wrr-queue cos-map 3 4 5
Switch(config)# wrr-queue cos-map 4 6 7
This example shows how to map CoS values 0, 1, 2, and 3 to CoS priority queue 2:
Switch(config)# wrr-queue cos-map 2 0 1 2 3
quid The queue id of the CoS priority queue. The range is 1 to 4 where 1 is the lowest CoS priority queue.
cos1…cosn The CoS values that are mapped to the queue id.
CoS Value CoS Priority Queues
0, 1 1
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2, 3 2
4, 5 3
6, 7 4
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(12c)EA1 CoS values were added to the no form of this command.

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http://www.cisco.com/application/pdf/en/us/guest/products/ps628/c2001/ccmigration_09186a00804760c6.pdf

QUESTION 13:
You recently added a Cisco Unity voice mail server to your Cisco CallManager IP
telephony solution. Your users are receiving voice mails, but the MWI light does not
go off after they have listened to all of their new voice mail messages.
What must be verified and possibly modified to resolve this issue?
A. Use the Port Usage tool to verify that the ports dedicated to MWI on/off are not
over-utilized.
Add another dedicated port if the current port is over-utilized.
B. Verify that the MWI “off directory number” has been configured on both the Cisco
Unity server and the Cisco CallManager cluster.
If it has not been configured, configure it on both the Cisco Unity server and Cisco
CallManager cluster.
C. Verify the number of ports licensed for the Cisco Unity server as equal to the number
of configured ports.
D. Verify that the calls are being sent to the correct ports on the Cisco Unity server.
If the configured ports are incorrect on the CallManager cluster, change the values on the
cluster to be correct.
Answer: B
Cisco Unity Troubleshooting Guide, Release 3.1(3)
Message Waiting Indicators

http://www.cisco.com/en/US/partner/products/sw/voicesw/ps2237/prod_troubleshooting_guide_chapter09186a

0
QUESTION 14:
A new Cisco Unity voice mail system is being tested. The calls are being forwarded
to voice mail from the Automated Attendant console, but the callers are receiving
the wrong greeting.
What could be the problem?
A. The call routing rules are not working properly.
B. The mailbox under test is full.
C. The Unity ports for sending and receiving voice mails are not configured properly.
D. The Microsoft Exchange server has rejected the call due to a corrupted database.
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Answer: A
Note: Uncertainty
There a quite a few references to A being true too, so hard to tell what Cisco actually
believes the answer for the test is….
QUESTION 15:
What are the two most common causes of echo? (Choose two)
A. Acoustic feedback from speaker phones.
B. Impedance mismatch at the 2-wire to 4-wire hybrid.
C. Misconfigured tail circuits.
D. Signal reflection.
E. IP phone software loads.
Answer: A, B
There are two type of echo, electrical echo (including impedance mismatch) and
acoustical echo (including acoustical coupling from the handset.
Troubleshooting Echo Problems between IP Phones and IOS Gateways
Document ID: 19640
Introduction
This document describes how to troubleshoot and eliminate echo where possible in IP Telephony networks with
Cisco
IOS(r) gateways.
There are two sources of echo:
* Hybrid echo
* Acoustic echo
Hybrid echo is caused by an impedance mismatch in the hybrid circuit, such as a two-wire to four-wire
interface. This
mismatch causes the Tx signal to appear on the Rx signal.
Acoustic echo is caused by poor acoustic isolation between the earpiece and the microphone in handsets and
hands-free devices.
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http://www.cisco.com/en/US/partner/tech/ck652/ck698/technologies_tech_note_09186a0080149a1f.shtml

Not D: Signal reflection is a consequence of impedance mismatch.
QUESTION 16:
Which unity troubleshooting tool would be used to diagnose problems with skinny
and MWI?
A. trace tool
B. configuration tool
C. diagnostic tool
D. maestro tool
Answer: C
Cisco Unity Troubleshooting Guide (With Lotus Domino), Release 4.0(1)
CiscoUnity Diagnostic Tool
The CiscoUnity Diagnostic Tool allows creating and viewing of diagnostic log files to
troubleshoot problems. It replaces the diagnostic log functionality in Maestro Tools, and
allows the system administrator or TAC staff to selectively run diagnostic traces at two
levels:
1. Macro Traces-These are collections of component traces that help diagnose problems
such as message waiting indicator and system problems.
2. Micro Traces-These are the component traces. Each component has up to 32 trace
levels that can be individually selected.
The CiscoUnity Diagnostic Tool also allows the system administrator or TAC staff to
perform the following tasks:
1. Create new log files on demand. This makes troubleshooting problems easier. When a
problem can be reproduced reliably, the system administrator can close all existing log
files and create new log files prior to reproducing the problem. This eliminates many
unnecessary and unrelated items from the logs.
2. Configure log settings. The system administrator can adjust the maximum disk space
allowed for all diagnostic log files. (The default setting is 400 MB.) The Logging
Properties screen also allows the system administrator to disable all diagnostic output by
clearing the Diagnostic Output check box.
3. Gather standard logs. This option provides the ability to quickly gather all or selected
Microsoft Windows and CiscoUnity logs.
4. Disable all traces. This is a quick way to return diagnostic logs to their default settings
after troubleshooting efforts are complete.
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5. View the Event log. The Event log files for either the local computer or another
computer can be viewed and exported.
6. Change the display language for Windows Event log messages that are generated by
Cisco Unity. This is a temporary change and is only in effect while the Cisco Unity
Diagnostic Tool is running.
QUESTION 17:
Following a partial configuration of an access layer switch:
mls qos map cos-dscp 0 8 12 16 28 32 40 46
mls qos
!
Voice bearer traffic will be set to which per hop behavior?
A. ef
B. cs4
C. af32
D. af12
E. be
Answer: B
mls qos map
To define the multilayer switching (MLS) class of service (CoS)-to-differentiated
services code point (DSCP) map or DSCP-to-CoS map, use the
mls qos map command in global configuration mode. To return to the default map, use
the no form of this command.
mls qos map {cos-dscp dscp1…dscp8 | dscp-cos dscp-list to cos}
no mls qos map {cos-dscp | dscp-cos}
Syntax Description
cos-dscp
dscp1…dscp8
Defines the CoS-to-DSCP map. For
dscp1…dscp8, enter eight DSCP values
that correspond to CoS values 0 to 7.
Separate consecutive DSCP values from
each other with a space. The supported
DSCP values are 0, 8, 10, 16, 18, 24, 26,
32, 34, 40, 46, 48, and 56.
dscp-cos dscp-list to
cos
Defines the DSCP-to-CoS map. For
dscp-list, enter up to 13 DSCP values
separated by spaces. Then enter the to
keyword. The supported DSCP values
are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40,
46, 48, and 56. For cos, enter the CoS
value to which the DSCP value or
values correspond. The CoS range is 0
to 7.
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Defaults
Table 1 shows the default CoS-to-DSCP map.
Table1 Default CoS-to-DSCP Map
CoS 0 1 2 3 4 5 6 7
Value
DSCP 0 8 16 26 32 46 48 56
Value
Table 2 shows the default DSCP-to-CoS map.
Table2 Default DSCP-to-CoS Map
DSCP 0 8, 10 16, 18 24, 26 32, 34 40, 46 48 56
Values
CoS 0 1 2 3 4 5 6 7
Value

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hlsw_r/lan_a1h.htm#wp1111205

QUESTION 18:
You have recently installed IP Phones on a centralized model. At a remote branch
using a H.323 gateway, users are complaining they cannot call some internal
numbers. After dialing the last digit, they get a reorder tone.
What is the most likely cause?
A. Partition/CSS configuration issue
B. Gateway dial-peer configuration issue
C. Codec mismatch
D. Call Admission Control
Answer: D
In centralized processing environment, the locations feature in Cisco CallManager lets
you specify the maximum amount of audio bandwidth (for audio calls) that is available
for calls to and from each location.
This limits the number of active calls and limits oversubscription of the bandwidth on the
IP WAN links. If any additional calls try to exceed the bandwidth limit, the system
rejects them, the calling party receives reorder tone, and a text message displays on the
phone.
QUESTION 19:
The default configuration of dial peer 0 will fail to set which three of the following?
(Choose three)
A. DID
B. Toolkit Command Language (TCL) applications
C. Non-default voice-network capabilities: dtmf-relay, vad, and other commands
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D. ANI with answer address
E. DNIS with incoming called number
Answer: A, B, C
Explanation:
If no incoming dial-peer is matched by the router or gateway, the inbound call leg is
automatically routed to a default dial peer (POTS or Voice-Network). This default dial
peer is referred to as dial-peer 0. Dial-peer 0 has a default configuration that cannot be
changed. The default dial-peer 0 fails to negotiate non-default capabilities, services, and
applications such as: (a) Non-default Voice-Network capabilities: dtmf-relay, no vad, so
forth, and so on. (b) Direct Inward Dial (DID) (c) TCL Applications
QUESTION 20:
An 802.1Q trunk is configured with mismatched native VLANs.
What is the most likely symptom?
A. Communication over the link occurs in one direction only.
B. Spanning Tree Protocol is disabled for all VLANs in the trunk.
C. The switch port is shut down and displays a port status of errDisable.
D. Layer 2 CoS markings are not mapping correctly to layer 3 QoS markings.
Answer: D

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