Actualtests 642-452
642-452: Implementing Cisco Unified Communications Manager Part 1 (CIPT1 v6.0) Last Updated Monday, July 21, 2008 with 164 Questions
CCVP Gateway Gatekeeper Exam (GWGK)
Exam Number: 642-452 Exam
Associated Certifications: CCVP Gateway Gatekeeper Exam (GWGK)
Duration: 156 Q&As
Available Language(s): English
Exam Details
The Gateway Gatekeeper exam assesses the knowledge of the Systems Engineer on the implementation of Cisco gateways and gatekeepers to integrate a VoIP network to both PSTN and TDM equipment. This includes implementing dial plans and advanced gateway features such as SRST and DSP resources. The exam also covers implementing gatekeepers and directory gatekeepers to provide hierarchical dial plan resolution and call admission control.
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QUESTION 1:
Which two functions are provided by a DSP farm? Select two.
A. called ID
B. transcoding
C. E911
D. directory lookup
E. conference bridging
F. music on hold
Answer: B, E
Explanation:
The DSP farm uses the DSP resources in network modules on Cisco
routers to provide voice-conferencing, transcoding, and hardware MTP services.
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 4-56 Implementing Advanced Gateway Features
QUESTION 2:
DRAG DROP
Answer:
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Explanation:
Why Choose H.323
* Integrated access
* Caller ID support on analog FXO
* Many more TDM interface types and signaling
* Dropping DSPs on hairpinned calls
* Gateway-resident applications like TCL and VXML
* CAC network design with H.323 gatekeepers
* No release dependencies between gateways and Cisco CallManager
* Much easier migration architecture to SIP
* Call preservation for Cisco SRST
* NFAS support
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 1-66 Function of Gateways and Gatekeepers
Using MGCP as the call control protocol to a gateway has the following advantages:
* Centralized configuration, control and download from Cisco CallManager
* Better feature interaction with capabilities like caller ID and name display
* Easy, centralized dial-plan management
* Gateway voice security features (voice encryption) as of Cisco IOS Software Release
12.3.(5th)T
* Q Signaling (QSIG) supplementary services as supported by Cisco CallManager:
- Cisco CallManager interconnects to a QSIG network using an MGCP gateway and T1
or E1 PRI connections to a private integrated services network (PISN). The MGCP
gateway establishes the call connections. Using the PRI backhaul mechanism, the
gateway passes the QSIG messages to the Cisco CallManager to set up QSIG calls and
send QSIG messages to control features.
- When a PBX is connected to a gateway that is using QSIG via H.323, calls that are
made between phones on the PBX and IP phones attached to the Cisco CallManager can
have only basic PRI functionality. The gateway that terminates the QSIG protocol
provides only the calling line ID (CLID) and DID number, instead of Cisco CallManager
providing that information.
* Enhanced call survivability:
- Calls from IP phones through an MGCP gateway are preserved on a CallManager
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failover. This feature avoids dropped calls when applying the monthly operation system
service release on the Cisco CallManagers
- In SRST mode, calls from IP phones through an MGCP gateway are preserved on
MGCP fallback for calls on analog or CAS circuits. Calls on ISDN circuits are dropped
on fallback.
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 1-67 Function of Gateways and Gatekeepers
QUESTION 3:
DRAG DROP
As an instructor at Certkiller .com you are required to click and drag the recommended redundancy
method to each layer of the gatekeeper hierarchy. An item may be used more than once.
Answer:
Explanation: Cisco recommends that you use gatekeeper clustering(that is Alternate Gatekeeper) to provide
gatekeeper redundancy whenever possible. Use HSRP for redundancy only if gatekeeper clustering is not
available in your software feature set.
In any layer of gatekeeper hierarchy, Alternate Gatekeeper method are recommended..
QUESTION 4:
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An NM-HDV2 is being configured for transcoding. Which Cisco IOS command marks the beginning of
the transcoding parameters?
A. dsp services transcoding
B. associate application transcoding
C. dspfarm profile 10 transcoding
D. voice-card 2 transcoding
Answer: C
Explanation:
Configuring a DSP Farm on the NM-HDV2 or NM-HD-1V/2V/2VE
Step 1:router#
Step 2:router#conf t
Step 3:router(config)#voice-card 2
Step 4:router(config-voicecard)#dsp services dspfarm
Step 5:router(config-voicecard)#exit
Step 6:router(config)#dspfarm profile 10 transcode
Step 7:router(config-dspfarm-profile)#description SAMPLE TRANSCODE
Step 8:router(config-dspfarm-profile)#code g729r8
Step 9:router(config-dspfarm-profile)#maximum sessions 6
Step 10:router(config-dspfarm-profile)#associate application sccp
Step 11:router(config-dspfarm-profile)#no shutdown
Step 12:router(config-dspfarm-profile)#exit
Step 13:router(config)#gateway
Step 14:router(config-gateway)#timer receive-rtp 1200
Step 15: end or return to step 6 to continue configuring DSP farm profiles
IOS syntax for step 6 is: dspfarm profile profile-identifier {conference | mtp | transcode}
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 4-66 Implementing Advanced Gateway Features
QUESTION 5:
Network topology exhibit
You are working with Certkiller .com in the lab to test toll bypass. There are two small PBXs designated
PBX Certkiller A and PBX Certkiller B that have been connected back-to-back to simulate a tie-line from
the PSTN. The client would like to remove the tie-line and carry his voice traffic over the IP WAN.
Which four main parameters define how the connection will be configured between the gateway and the
PBX? Choose four.
A. WAN link speeds
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B. E&M type and wiring scheme
C. support for option 81 on the PBX
D. start dial supervision signaling
E. address signaling type
F. audio implementation
Answer: B, D, E, F
Explanation:
PBX configuration support: The following presents the key
information required to ensure that a Cisco voice gateway can be configured to
support calls from a legacy PBX:
- E&M signaling type (I, II, III, IV or V)
- Audio implementation (2-wire or 4-wire)
- Start dial supervision (wink-start, immediate or delay-dial)
- Dial method (dual tone multifrequency [DTMF] or pulse)
- Call progress tones (standardized within geographic regions)
- PBX port impedance
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-9 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 6:
Exhibit
Certkiller .com is integrating a Cisco CallManager system with the existing PBX via an E1 QSIG trunk.
After the initial configuration, no calls can be placed from IP phones to PBX phones.
How can this problem be resolved?
A. Add the command isdn contiguous-bchan to the serial interface.
B. change the channel selection order from descending to ascending.
C. Add the command isdn negotiate-bchan to the serial interface.
D. Increase the ISDN T302 timer to allow more time for call setup.
Answer: C
Explanation: By default, Cisco router will not accept a different B-channel. To enable the router to accept a
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B-channel that is different from the B-channel requested in the outgoing call setup message, use the isdn
negotiate-bchan interface configuration command.
QUESTION 7:
Which three functions can be performed by a gatekeeper? Select three.
A. voice QoS
B. admission control
C. zone management
D. address translation
E. voice media transport
F. conferencing for H.323 terminals
Answer: B, C, D
Explanation:
Mandatory Gatekeeper Functions
- Address Translation: A gatekeeper translates H.323 IDs and standard E.164 telephone
numbers to endpoint IP addresses.
- Admission Control: Controls endpoint admission into the H.323 network. To achieve
this, the gatekeeper uses H.225 Registration, Admission, and Status (RAS) messages and
Admission Request (ARQ), Admission Confirmation (ACF), and Admission Rejection
(ARJ) messages.
- Bandwidth Control: Gatekeepers use H.225 Bandwidth Request (BRQ), Bandwidth
Confirmation (BCF), and Bandwidth Rejection (BRJ) messages to manage endpoint
bandwidth requirements.
- Zone Management: The gatekeeper manages all registered endpoints in the zone.
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 1-7 Function of Gateways and Gatekeepers
QUESTION 8:
Certkiller .com is having trouble managing its fully meshed gatekeepers. What can be done to ease this
administrative problem?
A. install an H.323 proxy server
B. implement a directory gatekeeper
C. group the gatekeepers into clusters
D. separate the gatekeepers into zones
Answer: B
Explanation: By using a directory gatekeeper, it is no longer necessary to have a full
mesh between gatekeepers, which is a major advantage. Directory gatekeepers
centralize the dial plan and also serve as a potential interface to other centralized
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applications. Without a directory gatekeeper, you would have to add an entry in
every gatekeeper on the network every time you add a new zone on one of the
gatekeepers. However, with a directory gatekeeper, you can add the new zone in the
local gatekeeper and the directory gatekeeper only. If the local gatekeeper cannot
resolve a call request locally, it forwards that request to the directory gatekeeper
with a matching zone prefix.
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 5-7, 88 Deploying Gatekeepers
QUESTION 9:
The phone company is delivering circuits for a new VoIP deployment to connect to the PSTN. The
circuits will support four simultaneous calls and provide the name and number of the calling party.
Which interface type should be installed?
A. E&M
B. FXO
C. FXS
D. T1 CAS
Answer: B
Explanation:
The two circuit options that are available are analog and digital. The advantages and
shortcomings of individual analog and digital circuit options that can be deployed in
Cisco voice gateways are summarized in the following list:
* Subscriber loop: Subscriber loop is usually a low-cost solution and is used when
traditional phones connect directly to a voice gateway with a Foreign Exchange Station
(FXS) interface. The two types of interfaces that make up subscriber loop trunks are the
following:
- Foreign Exchange Office (FXO): Use FXO ports to connect to a central office (CO),
PBX, or key telephone system. You can configure loop-start or ground-start signaling
interfaces, depending on the model of voice interface card or network module selected.
- FXS: Use FXS ports to connect to any plain old telephone service (POTS) device such
as analog phones, fax machines, and legacy voice-mail systems.
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-4 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 10:
Certkiller .com is using a NH-HDV2 for transcoding services within a Cisco CallManager environment.
Which command will instruct the voice gateway to register with a Cisco CallManager with IP address
10.172.15.4.
A. sccp ip-address 10.172.15.4 priority 1 version 4.0
B. sccp ccm 10.172.15.4 priority 1 version 4.0
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C. sccp register 10.172.15.4 priority 1 version 4.0
D. sccp server 10.172.15.4 priority 1 version 4.0
Answer: B
Explanation:
Perform this task to enable SCCP on the local interface that a DSP
farm uses to register with Cisco CallManager. This step is the same for either DSP
type.
Configuring a DSP Farm - Common Steps
Step 1: enable
Step 2: configure terminal
Step 3: sccp ccm {ip-address | dns} identifier identifier-number [port port-number]
[version version-number] or sccp ccm {ip-address | dns} priority priority priority [port
port-number] [version version-number]
Step 4: sccp local interface-type interface-number
Step 5: sccp
Step 6: sccp ip predecence value
Step 7: exit
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 4-65 Implementing Advance Gateway Features
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