CLCOR ON Premises Call Control — 50 Questions

Question 1

A CUCM administrator is configuring a SIP trunk for a new ITSP. Which THREE actions must be performed to ensure proper inbound call routing from the provider?

Accepted Answer

Configure the Inbound Calling Search Space on the SIP Trunk.. Inbound routing requires a SIP trunk, a properly configured Inbound CSS on the trunk, and a Translation Pattern or Route Pattern to match the incoming ANI/DNIS.

Answer

Assign a Device Pool that includes a dedicated MTP for every inbound call.

Answer

Set the 'Redirecting Number IE Delivery' to 'Off' for all ITSP trunks.

Question 2

You are configuring a new location-based CAC policy in CUCM. You need to ensure that calls between two specific locations are restricted based on available bandwidth. Where must you configure the location relationship to define the audio bandwidth limit?

Accepted Answer

System > Location > Location Link. In CUCM, the link between two locations must be defined under System > Location Bandwidth Manager > Link, specifying the bandwidth available for audio, video, and immersive video between the two specific locations.

Answer

System > Region Information

Answer

Device > Device Settings > Location

Answer

System > Service Parameters > Bandwidth Manager

Question 3

You are troubleshooting a one-way audio issue on calls routed through a specific region. Which setting in the Region configuration specifically controls the codec used between two locations?

Accepted Answer

Max Audio Bit Rate. The 'Region' configuration defines the 'Audio Codec' allowed between two regions in the 'Region Relationship' matrix.

Answer

Network Locale

Answer

Location Bandwidth

Answer

Codec Preference List

Answer

Device Pool Assignment

Question 4

Which TWO of the following are valid components of an MRGL (Media Resource Group List)?

Accepted Answer

Another Media Resource Group. An MRGL is a list of MRGs. Therefore, you add MRGs to the list, and those MRGs contain media resources.

Answer

Conference Bridge

Answer

Region

Answer

Device Pool

Question 5

Which THREE of the following are valid states that can be configured in a Route List?

Accepted Answer

Standard Local Route Group. A Route List defines an ordered path. The items in that path are Route Groups, which have specific behaviors like 'sequential' or 'top-down' selection.

Answer

Partition

Answer

CSS

Question 6

You are configuring a URI-based dial plan in CUCM 14. You have successfully enabled 'Allow Proxying of Requests' on the SIP Trunk Security Profile. What is the next mandatory configuration step to ensure the CUCM can correctly route incoming calls based on the Request-URI?

Accepted Answer

Configure a SIP Route Pattern for the domain portion of the URI.. To route incoming URI calls, the CUCM must be configured to accept the URI. This is done by checking the 'Accept Presence Subscription' or ensuring the SIP Trunk is associated with a Routing Lookup Policy that supports URI routing.

Answer

Add a translation pattern with a CSS that includes all partitions.

Answer

Disable the 'Redirect by Application' setting on the trunk.

Answer

Change the SIP Trunk protocol to H.323 for better URI handling.

Question 7

You have a cluster with two nodes. You need to verify the database replication status between the publisher and the subscriber. Which CLI command is the correct choice?

Accepted Answer

utils dbreplication runtimestate. The command 'utils diagnose test' or 'utils dbreplication runtimestate' is used to check the health of the database synchronization between nodes.

Answer

show status

Answer

utils network connectivity

Answer

show cluster status

Question 8

You are configuring a SIP trunk for a third-party gateway. The gateway requires the 'Diversion' header to be sent for call forwarding. Which setting on the SIP Profile enables this?

Accepted Answer

Diversion Header Delivery - Outbound. The 'Redirect by Application' or 'Diversion Header' settings in the SIP Profile determine how call forwarding info is passed to external gateways.

Answer

SIP Trunk Security Profile

Answer

Redirect by Application

Answer

Diversion Header Delivery - Inbound

Question 9

You are observing that calls are failing between two H.323 gateways. Which tool is best for verifying the H.225/H.245 signaling?

Accepted Answer

Real-Time Monitoring Tool (RTMT). The 'Cisco Unified Communications Manager Traces' viewed via RTMT are the primary way to debug H.323/SIP signaling messages.

Answer

Dialed Number Analyzer

Answer

Cisco Unified Reporting

Answer

Bulk Administration Tool

Question 10

When troubleshooting a failing call, which THREE items should be checked in the 'Route Pattern' configuration?

Accepted Answer

Numbering Plan type. Route pattern configuration impacts reachability, routing, and digit manipulation, making these the key areas for verification.

Answer

The phone's firmware version.

Answer

The Device Pool's date/time group.

Question 11

Which TWO configuration steps must be completed to ensure proper redundancy for a CUCM group? (Select TWO)

Accepted Answer

Assign the Device Pool to the device. To ensure CUCM redundancy, the Cisco Unified Communications Manager Group must be assigned to the Device Pool, and the Device Pool must be assigned to the phone.

Answer

Configure a separate SIP trunk for each node

Answer

Create a new partition for each node

Answer

Enable Heartbeat on the physical switch

Question 12

An administrator needs to ensure that internal calls between two sites are routed over an MTP-required SIP trunk, but the calls are failing due to codec mismatch. Which CUCM service parameter setting should be verified to allow the MTP to be inserted?

Accepted Answer

Check the MTP Required checkbox on the SIP trunk configuration and ensure the MRGL includes an MTP resource.. The 'MTP Required' checkbox on the SIP Trunk configuration page must be checked, and the Media Resource Group List (MRGL) must contain an MTP resource associated with the device pool.

Answer

Increase the 'Maximum Number of MTP Resources' in the Service Parameters.

Answer

Change the SIP Trunk Security Profile to 'Non-Secure' to bypass encryption negotiation.

Answer

Modify the Region settings to force G.711 codec between the two sites.

Question 13

A user reports that calls to an external PSTN number are failing. The trace shows a '403 Forbidden' response from the provider. Where in CUCM should the administrator investigate the outbound calling search space (CSS) settings?

Accepted Answer

Device > Phone > CSS. The Device CSS or Line CSS determines the permissions for a specific device, and they must be configured to include the partition containing the route pattern.

Answer

Media Resources > Conference Bridge

Answer

System > Service Parameters

Answer

Device > Trunk > Transformation CSS

Question 14

An administrator is configuring a new SIP trunk between CUCM and a CUBE. To ensure that CUCM correctly handles mid-call signaling updates such as hold/resume, which parameter in the SIP Profile should be verified?

Accepted Answer

SIP Rel1XX Options. The 'SIP Rel1XX Options' or 'Send PRACK' parameters are vital for robust SIP signaling, though 'SIP Rel1XX Options' specifically governs the handling of provisional responses.

Answer

Retry Count

Answer

Disable Early Media on 180

Answer

SIP Timer T1

Question 15

A user reports that their calls are failing when they roam to a different physical office site. You observe that the device is registered to the primary CUCM cluster but the Location-based CAC is blocking the call. What is the most likely cause?

Accepted Answer

The device is not assigned to a Device Pool with the correct Location configured for the new site.. If a device roams, it may inherit a different Location assigned via the Device Pool. If the bandwidth limit between the new location and the destination is exceeded, the call will be rejected.

Answer

The Region setting in the Device Pool has a lower bitrate than the required codec.

Answer

The device must be re-registered to a local subscriber instead of the primary cluster.

Answer

The Calling Search Space is not configured to allow inter-site dialing.

Question 16

You are troubleshooting a scenario where internal calls between two offices are using the G.711 codec, but you want them to use G.729 to save bandwidth. Where should you change the codec setting?

Accepted Answer

System > Region Information > Region. The codec used between two devices is determined by the Region setting. You must update the Region matrix to specify G.729 between the two regions.

Answer

Device > Device Settings > Common Device Configuration

Answer

System > Device Pool

Answer

System > Location

Question 17

When designing a redundant CUCM deployment, which mechanism ensures that if a primary subscriber fails, phones automatically register to a secondary subscriber?

Accepted Answer

CM Group. The Cisco Unified Communications Manager Group (CM Group) defines the ordered list of CUCM servers that a device will attempt to register with.

Answer

SIP Trunk Security Profile

Answer

Route List

Answer

Device Pool

Question 18

You need to prevent certain internal users from making international calls while allowing them to dial local numbers. What is the most efficient way to implement this in CUCM?

Accepted Answer

Assign a CSS to the device that includes a Partition containing local routes but excludes a Partition containing international routes.. Partitioning and Calling Search Spaces (CSS) are the standard mechanisms in CUCM to restrict dialing privileges based on the source of the call.

Answer

Use an Application Dial Rule.

Answer

Modify the device pool's location.

Answer

Configure a Route Filter on the Route Pattern.

Question 19

Which component in CUCM is responsible for providing the necessary resources for conference calls, such as hardware or software-based conference bridges?

Accepted Answer

Media Resource Group. Media Resource Groups (MRG) collect media resources like conference bridges, and MRG lists (MRGL) determine which resources are available to specific devices.

Answer

Region

Answer

Route Group

Answer

Device Pool

Question 20

If a Translation Pattern is configured in CUCM, at what stage of the call processing does the digit manipulation occur?

Accepted Answer

Before the Route Pattern is matched.. Translation Patterns act as a mid-call processing step. When a digit string is dialed, CUCM checks for Translation Patterns before checking Route Patterns.

Answer

After the call is sent to the gateway.

Answer

At the device level during registration.

Answer

Only when the call fails to route.