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Exam A
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

Correct Answer: BE Section: (none) Explanation
Explanation/Reference:
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

A.
B.
C.
D.

Correct Answer: Section: (none)
Explanation

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 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.

A.
B.
C.
D.

Correct Answer: Section: (none) Explanation
Explanation/Reference:

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
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

Correct Answer: C Section: (none)Explanation
Explanation/Reference:
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
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

Correct Answer: BDEF Section: (none)Explanation
Explanation/Reference:
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.

Correct Answer: C Section: (none)Explanation
Explanation/Reference:
Explanation: By default, Cisco router will not accept a different B-channel. To enable the router to accept a 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

Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
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

Correct Answer: B Section: (none)Explanation
Explanation/Reference:
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 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

Correct Answer: B Section: (none)Explanation
Explanation/Reference:
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
C. sccp register 10.172.15.4 priority 1 version 4.0
D. sccp server 10.172.15.4 priority 1 version 4.0

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
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
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 ! 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*

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
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 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.

Correct Answer: ADE Section: (none)Explanation
Explanation/Reference:
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 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
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.

Correct Answer: BE Section: (none)Explanation
Explanation/Reference:
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 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 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

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
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

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