CCVP Gateway Gatekeeper Exam (GWGK) : 642-452 Exam
642-452 GWGK
Gateway Gatekeeper Exam

Retired 4/26/07
Exam Number: 642-452
Associated Certifications: CCVP
Duration: 90 minutes (55-65 questions)
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
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.

Exam Topics
Explain the function and interoperation of Gateways within a converged network
Compare and contrast the different protocols used on the Gateways, and the appropriate application of each protocol
Explain the differences between the various Digital and Analog line protocols
Describe and explain QSIG and its implementation
Describe and explain drop and insert multiplexing features

Configure and implement DSP resources to support specified requirements
Explain the capabilities and functions of a DSP resources
Configure a DSP resources to support transcoding
Configure a DSP resources to support conferencing

Explain the function and interoperation of Gatekeepers within a converged network
Explain the function of Gatekeepers
Explain the interoperation of a Gatekeeper and the call agent
Describe and explain the Gatekeeper transaction message protocol and it’s usages

Determine the relevant technical and business needs that effect the choice of Gateway features, protocols and placement
Select the correct placement of the Gateway within a given network topology to meet stated requirements
Given different Telco and PBX system offerings, determine which Gateway services can be supported
Select the correct protocol to support the required features (Fax relay, modem relay, pass-though, survivability, caller-ID, caller name display)

Determine the relevant technical and business needs that effect the choice of Gatekeeper features and placement
Select the correct placement of the Gatekeeper within a given network topology to meet stated requirements
Select the appropriate Gatekeeper functionality given stated business and technical requirements. (call admission control, dial-plan resolution)

Configure and implement a Gateway to interface with the PSTN
Configure PRI connectivity (switch type, signaling)
Configure BRI connectivity (switch type, signaling)
Configure CAS connectivity ( feature group B and D, E1 R2)
Configure Analog connectivity (loop and ground start, FXO, DID, FXS)
Configure drop-and-insert feature
Verify and troubleshoot configurations

Configure and implement a Gateway to interface with a PBX and voice mail system
Configure analog connectivity (FXO, FXS, E&M types 1-4)
Configure PRI connectivity (switch type, Qsig, signaling)
Configure BRI connectivity (switch type, signaling)
Configure CAS connectivity ( feature group B and D, E1 R2)
Configure additional voicemail connectivity features (DTMF 4th column, etc)
Configure IP circuit emulation feature
Verify and troubleshoot configurations

Design and deploy a dial-plan to meet specific requirements
Configure digit manipulation. (translation rules, number expansion)
Design call routing scheme to meet technical and business requirements
Configure alternate call routing. Based on resource availability or cost
Implement and configure COR to meet business requirements
Configure Gateway to use Gatekeeper for call resolution
Configure call agent to use Gatekeeper for call resolution
Verify and troubleshoot configurations

Implement extended services on the Gateway including Auto Attendant and Accounting/Billing
Download TCL scripts
Configure Auto Attendant using TCL scripts
Describe TCL usages (Billing, Radius, AAA)

Design and deploy redundant Gateway configurations to provide high availability
Implement SRST on the Gateway
Describe necessary physical connectivity requirements to support redundant gateways

Design and deploy redundant Gatekeeper configurations to provide high availability
Configure HSRP between Gatekeeper devices
Configure Gatekeeper clustering

Configure and implement Gateways and Gatekeepers within a managed services or service provider environment
Determine when an IP-IP Gateway is necessary to meet technical and business requirements
Configure IP-IP Gateways
Describe and explain when the OSP protocol is necessary to meet technical requirements
Contrast the Enterprise and Service Provider environments

Exam Number/Code: 642-452
Exam Name:CCVP Gateway Gatekeeper Exam (GWGK)

“CCVP Gateway Gatekeeper Exam (GWGK)”, also known as 642-452 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 156 Q&As to your 642-452 Exam preparation. In the 642-452 exam resources, you will cover every field and category in CCVP helping to ready you for your successful Cisco Certification.
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Exam DetailsThe 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.

QUESTION 11:
Network topology exhibit
Certkiller .com ITSP would like to be able to test an IP-to-IP gateway. Certkiller .com has set up two ITSPs
in the lab to simulate a real-world situation.
Which set of commands will configure the VZ. Certkiller gatekeeper correctly?
A. gatekeeper
!
zone local VZ Certkiller Certkiller 10.24.10.43
zone remote VZ Certkiller Certkiller 10.24.10.44 in Z1 Certkiller
zone remote Z1AJAX ajax 10.24.10.144 1079 in Z1 Certkiller
zone prefix Z1AJAX 919*
B. gatekeeper
!
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zone local Z1AJAX ajax 10.24.10.44
zone remote VZ Certkiller Certkiller 10.24.10.43 invia Z1AJAX
zone remote Z1AJAX ajax 10.16.8.144 1719 outvia Z1AJAX
zone prefix Z1AJAX 919*
C. gatekeeper
!
zone local Z1AJAX ajax 10.24.10.44
zone remote VZ Certkiller Certkiller 10.24.10.43 in Z1AJAX
zone remote Z1AJAX ajax 10.16.8.144 1719 out Z1AJAX
zone prefix Z1AJAX 919*
D. gatekeeper
!
zone local VZ Certkiller 10.24.10.43
zone remote Z1 Certkiller Certkiller 10.24.10.44 invia VZ Certkiller
zone remote Z1AJAX ajax 10.16.8.144 1719 outvia Z1 Certkiller
zone prefix Z1AJAX 919*
Answer: D
Explanation:
Cisco Multiservice IP-to-IP Gateway and Gatekeeper Design
- Via-zones are a new concept designed to assist in configuring an IP-to-IP gateway.
- IP-to-IP gateways register with the gatekeeper as an IP-to-IP gateway via-zones
The important thing to notice in the figure is that the gatekeeper called GK is configured
to point the IP-to-IP gateway to process voice calls. The gatekeeper points to the IP-to-IP
gateway via the commands invia and outvia. Also, note that the zone local specifies a
zone controlled by a gatekeeper, thus obviously the zone local is VZ Certkiller .
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 6-25 Introducing Service Provider Offerings
QUESTION 12:
Exhibit
You are working with the customer Certkiller .com who is using QSIG to create a PINX between the four
PBX locations. Certkiller 1, Certkiller 2, and Certkiller 4 have PRI connections to the PSTN, and Certkiller 3
as four BRI connections to the PSTN. Certkiller .com would like to start using the existing IP WAN to do
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toll bypass. The Certkiller 1 and Certkiller 4 locations use the same PBX manufacturer and Certkiller 2 uses
a different manufacturer. In testing this solution, the Certkiller 2 location can communicate with the
PSTN, but is not communicating with the local IP WAN gateway. The PBX in Certkiller 2 requires the
PRI to be DMS-100 user-side signaling and is using 16 channels.
Certkiller 2#show running-configuration
!
controller t1 1/0:23
pri-group timeslots 1-16, 24
!
interface serial 1/0:23
isdn switch-type basic-5ess
isdn contiguous-bchan
isdn protocol-emulate network
isdn incoming-voice voice
!
end
From the above router configuration, which three commands need to be edited to resolve this issue?
Select three.
A. The idsn contiguous-bchan command should be removed because it is only relevant to E1 interfaces.
B. The interface serial 1/0:23 command should actually be 1/0:16 because only 16 voice channels are being
used.
C. The isdn protocol-emulate network command needs to be changed to isdn protocol-emulate user.
D. The configuration is missing the line code and framing statements.
E. The switch-type command needs to be changed to basic-dms100.
Answer: A, D, E
Explanation:
test-router(config-controller)#pri-group timeslots 1-16
The IOS will automatically append the ,24 so the controller t1 will be displayed in the
start and running configuration as: pri-group timeslots 1-16,24
Note that after configuring the pri-group command, the D channel (interface serial
1/0:23) and the voice port (voice-port 1/0:23) are created automatically by the router.
Complete instructions for the configuration of the ISDN PRI voice-interface support can
be found at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/isdnv_c/isdn01.htm#wp103

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8
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-121 to 130 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 13:
Which two features are benefits of using HSRP for gatekeeper redundancy? Select two.
A. The gatekeepers can load balance
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B. The HSRP priority can be adjusted.
C. End devices do not have to re-register after a primary gatekeeper failure.
D. The gatekeepers may be located across WAN links for spatial redundancy.
E. It uses a virtual IP address that is shared between the devices.
Answer: B, E
Explanation: Select one interface on each gatekeeper to serve as the HSRP interface
and configure these two interfaces so that they belong to the same HSRP group but
have different priorities. The one with the higher priority will be the active
gatekeeper; the other assumes the standby role. Make a note of the virtual HSRP IP
address shared by both of these interfaces. (For details on HSRP and HSRP
configuration, refer to the Cisco IOS IP Configuration Guide.) If the primary
gatekeeper fails in an HSRP redundancy model, the failure is transparent to the
endpoint because the endpoints are pointing to the virtual HSRP router.

http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1835/products_configuration_guide_chapter091

8
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 5-108 Deploying Gatekeepers
QUESTION 14:
Which configuration would be used to support a company whose DID ranges come
out of multiple area codes served by the same PSAP?
A. voice-port 0/0
ani mapping 0 408
ani mapping 1 510
ani mapping 2 650
ani mapping 3 415
signal cama KP-2-ST
B. voice-port 0/0
ani mapping 0 408
ani mapping 1 510
ani mapping 2 650
ani mapping 3 415
signal cama KP-NPD-NXX.-XXXX-ST
C. translation-rule 1
rule 1^408 0
rule 2^510 0
rule 3^650 0
rule 4^415 0
voice-port 0/0
signal cama KP-NPD-NXX.-XXXX-ST
translate calling 1
D. translation-rule 1
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rule 1 0 408 0
rule 2 1 510 0
rule 3 2 650 0
rule 4 3 415 0
voice-port 0/0
signal cama KP-2-ST
translate calling 1
Answer: B
Explanation:
Router(config-voiceport)# ani mapping NPD-value NPA-number
Use this command to build the table that translates the Numbering Plan Area (NPA), or
area code, into a single MF digit. The number of Numbering Plan Digits (NPDs) that are
programmed is determined by local policy and by the number of NPAs or area codes that
the PSAP servers. The NPD value range is 0 to 3. The NPA number range is 100 to 999.
To disable ANI mapping, use the no form of this command.
Of the four CAMA signaling options for transmitting the calling number, the
KP-NPD-NXX-XXXX-ST is the option used for an 8-digit ANI transmission in which
the NPD is a single MF digit that is expanded into the NP
A. The NPD table is
preprogrammed by configuring ANI mapping in the sending and receiving equipment (on
each end of the MF trunk);for example 0=408, 1=510, 2=650, 3=415
- NPD values range from 0 to 3. Examples of telephone numbers in this signaling option
are:
* 05550123 = (408)555-0123
* 25550199 = (650)555-0199
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-43 to 46 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 15:
Exhibit
You are working with the customer Certkiller .com who is using QSIG to create a PINX between the four
PBX locations. Certkiller 1, Certkiller 2, and Certkiller 4 have PRI connections to the PSTN, and Certkiller 3
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a 256-kbps connection to the PSTN. Certkiller .com would like to start using the existing IP WAN to do
toll bypass. The Certkiller 1 and Certkiller locations use the same PBX manufacturer and Certkiller 2 uses a
different manufacturer. The PBX in Certkiller 2 is configured for DMS-100 user-side signaling and is
using 16 channels. The PRI is using ESF and B8ZS. Certkiller .com needs some help with configuring this
gateway.
Which set of commands will make this operate correctly?
A. controller t1 1/0
pri-group timeslots 1-16, 24
!
interface serial 1/0:23
isdn switch-type basic-5ess
isdn continuous-bchan
isdn protocol-emulate network
no shut
B. controller t1 1/0
pri-group timeslots 1-16, 24
framing esf
linecode b8zs
!
interface serial 1/0:16
isdn switch-type basic-dms100
isdn protocol-emulate user
no shut
C. controller t1 1/0
pri-group timeslots 1-23, 24
framing esf
linecode hdb3
!
interface serial 1/0:23
isdn switch-type basic-net3
isdn protocol-emulate network
D. controller t1 1/0
pri-group timeslots 1-16, 24
framing esf
linecode b8zs
!
interface serial 1/0:23
isdn switch-type basic-qsig
isdn protocol.-emulate network
no shut
E. controller t1 1/0
pri-group timeslots 1-16, 24
framing esf
linecode b8zs
!
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interface serial 1/0:23
isdn switch-type basic-dms100
isdn protocol.-emulate network
no shut
Answer: E
Explanation:
While in controller configuration mode, configure framing, linecode
and timeslots.
test-router(config-controller)#pri-group timeslots 1-16
This command shown above will automatically append the ,24 so the controller t1 will be
displayed in the start and running configuration as: pri-group timeslots 1-16,24
After configuring the pri-group command, the D channel (interface serial 1/0:23) and the
voice port (voice-port 1/0:23) are created automatically by the router.
Complete instructions for the configuration of the ISDN PRI voice-interface support can
be found at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/isdnv_c/isdn01.htm#wp103

8
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-121 to 130 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 16:
Exhibit, Network Topology
Exhibit #2
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Certkiller .com has assigned extensions based on the dialing restrictions. All users in the range of 1000 to
1999 are to be set up so that they can dial only emergency and local calls via the PSTN. Given the
configuration of Certkiller 1, which types of calls can Phone-A actually make via the PSTN?
A. None
B. emergency calls only
C. emergency calls and local calls only
D. emergency calls, local calls, and long-distance calls only
E. any calls
Answer: C
Explanation:
The Class of Restrictions (COR) feature provides the ability to deny
certain call attempts
based on the incoming and outgoing CORs provisioned on the dial-peers.
COR is used to specify which incoming dial-peer can use which outgoing
dial-peer to
make a call. Each dial-peer can be provisioned with an incoming and an
outgoing COR list.
In the question, the corlist command sets the dial-peer COR parameter for
dial-peers(VoIP)
and the directory number (1374) that is created for analog phone connected
to Cisco VoIP gateway.
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COR functionality provides the ability to deny certain call attempts on the
basis of the incoming and
outgoing class of restrictions that are provisioned on the dial-peers.
If the COR applied on an incoming dial-peer (for incoming calls) is a super
set or equal to the
COR applied to the outgoing dial-peer (for outgoing calls), the call goes
through.
Based on the above rule , Phone A only can make emergency calls and local
calls
successfully..
QUESTION 17:
Which configuration will provision an E1 for ITU Q421 digital line signaling and compelled register
signaling?
A. controller e1 1/0
cas-group 1 timeslots 1-31 type r2-digitial r2-compelled ani
B. controller e1 1/0
cas-group 1 timeslots 1-31 r2-compelled ani
C. controller e1 1/0
cas-group 1 timeslots 1-31 r2-digital ani
cas-custom 1
signaling r2-compelled
D. controller e1 1/0
cas-group 1 timeslots 1-31 type r2-compelled
cas-custom 1
signaling r2-digital
Answer: A
Explanation:
R2 inter-register signaling: These signaling types are configured using
the cas-group (controller e1) command.
The three signaling types are described as follows:
Line signaling includes the following types:
- R2 digital:R2 line-signaling type ITU-U Q.421 is typically used for PCM systems
(where A- and B-bits are used).
- R2 analog:R2 line-signaling type ITU-U Q.421 is typically used for carrier systems
(where a tone A-bit is used).
- R2 pulse:R2 line-signaling type ITU-U Supplement 7 is typically used for systems that
employ satellite links (where a tone A-bit is pulsed).
R2 compelled: When a tone pair is sent from the switch (forward signal), the tones stay
on until the remote end responds (by sending an acknowledgment [ACK]). The remote
responds with a pair of tones that signals the switch to turn off the tones. The tones are
compelled to stay on until they are turned off.. Additional information on E1R2 can be
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found in E1 R2 Signaling Theory at
http://www.cisco.com/en/US/tech/ CK6 52/ CK6 53/technologies_tech_note09186a00800943c2.shtml
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-80 to 90 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 18:
What is a benefit of implementing an IP-to-IP gateway?
A. provides IP network privacy and trust boundary for security
B. offers equivalent quality and cost savings when compared to back.-to-back gateways
C. works in conjunctions with gateway proxies to provide scalable video solutions
D. enhances policy-routing capability by assigning carrier IDs to partner gateways
Answer: A
QUESTION 19:
A gateway is connected to the PSTN via eight analog circuits. Which two methods can be used to route
calls across all eight circuits? Select two.
A. For each destination pattern, configure eight dial peers pointing to each port and use the preference
command to select which port is used.
B. Assign each port to a trunk group. For each destination pattern, configure a single dial peer pointing to the
trunk group.
C. Assign each port to a hunt list. For each destination pattern, configure a single dial peer pointing to the hunt
list.
D. For each destination pattern, configure a single dial peer. Use the port range command to select which port is
used.
E. For each destination pattern, configure eight dial peers pointing
Answer: A, B
QUESTION 20:
A service provider wants to add SIP devices to the existing H.323 voice network. Which Cisco device will
allow the SIP devices to use the existing routing structure on the H.323 gatekeeper?
A. SIP voice gateway
B. Cisco SIP Proxy Server
C. Cisco SIP Redirect Server
D. Cisco SIP Registrar Server
Answer: B

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