CLCOR Practice Test 11 — 15 Questions

Question 1

A company uses Webex Hybrid Calendar Service. Users report that the 'Join' button is missing from their Webex Room devices for scheduled meetings. What is the most likely cause?

Accepted Answer

The user's Exchange mailbox is not assigned to the Hybrid Calendar service. The 'Join' button on Webex Room devices for scheduled meetings is provided by the Hybrid Calendar Service, which requires the user's Exchange mailbox to be assigned to the service. If the mailbox is not assigned, the device cannot retrieve calendar information, and the Join button will not appear.

Answer

The Webex site is not integrated with the Control Hub

Answer

The Room device has not been registered to Webex

Answer

The Expressway-C does not have a public certificate

Question 2

Which TWO features are provided by the Cisco Webex App when registered as a Softphone?

Accepted Answer

SIP signaling. The Cisco Webex App, when registered as a softphone, functions as a SIP endpoint, so it performs SIP signaling (Option B) to set up, manage, and tear down calls with the call control platform. It also handles RTP media transmission (Option D), sending and receiving the actual audio/video packets for the call. These two functions are core to any softphone client, which must both signal and carry media. Options A, C, and E are incorrect because a softphone does not host TFTP configuration files, act as a DNS root server, or provide DHCP address assignment; those are infrastructure services typically provided by dedicated servers or network devices.

Answer

TFTP service hosting

Answer

DNS root server

Answer

DHCP server functionality

Question 3

Which THREE of the following are valid reasons to use a Media Termination Point (MTP)?

Accepted Answer

Bridging different signaling protocols. Option B is correct because an MTP can bridge different signaling protocols by terminating the signaling and media on each side, allowing calls to interconnect between otherwise incompatible protocol variants. Option C is correct because MTPs enable media anchoring, which is required for features such as call recording, lawful intercept, and certain supplementary services that need the media stream to pass through a controlled point. Option E is correct because MTPs provide DTMF interworking, converting out-of-band DTMF (for example, SIP INFO or H.323) into in-band or RFC 2833 events so that endpoints using different DTMF transport methods can communicate. Option A is not correct because transcoding between G.711 and G.729 is the function of a transcoder (hardware or software DSP resource), not an MTP. Option D is not correct because an MTP does not increase voice bandwidth; it terminates and relays media, and any bandwidth impact would typically be neutral or negative, not an increase.

Answer

Providing transcoding for G.711 to G.729

Answer

Increasing voice bandwidth

Question 4

You have implemented 'Local Route Group' in your dial plan. What is the main advantage of using this instead of static Route Groups?

Accepted Answer

It simplifies the dial plan by removing the need for location-specific route patterns.. Local Route Groups allow a single set of route patterns to be used across multiple locations by dynamically selecting the appropriate gateway based on the device's location. This eliminates the need to create duplicate route patterns for each location, simplifying the dial plan and reducing administrative overhead.

Answer

It forces the use of G.729.

Answer

It requires less CPU on the CUCM.

Answer

It allows faster call setup.

Question 5

What is the result of applying 'voice translation-profile' to an incoming dial-peer?

Accepted Answer

It modifies the digits. A voice translation-profile applied to an incoming dial-peer rewrites the calling, called, or redirecting numbers before the call is matched and routed. It uses translation rules to manipulate digits (add, strip, replace prefixes), which is why the correct result is digit modification.

Answer

It enables SIP

Answer

It changes the codec

Answer

It drops the call

Question 6

Which service must be active for CTI applications (like Cisco Finesse) to control phones?

Accepted Answer

Cisco CTIManager. Cisco CTIManager is the service that provides the Computer Telephony Integration (CTI) interface, allowing applications like Cisco Finesse, Jabber, and third-party CTI apps to monitor and control phones and lines. Without CTIManager active, CTI applications cannot control devices.

Answer

Cisco CallManager

Answer

Cisco TFTP

Answer

Cisco Database Layer Monitor

Question 7

Which file does an IP phone download first to obtain its configuration from the TFTP server?

Accepted Answer

SEP[MAC].cnf.xml. An IP phone booting on a CUCM network first obtains its network parameters via DHCP, then contacts the TFTP server and downloads its device-specific configuration file named SEP[MAC].cnf.xml, where [MAC] is the phone's MAC address in uppercase hex. This file contains the phone's DN, cluster TFTP addresses, and other settings. It is the primary per-device configuration file and is downloaded before any shared files like dialplan.xml or ringlist.xml.

Answer

Dialplan.xml

Answer

Ringlist.xml

Answer

CTLFile.tlv

Question 8

Which component allows for automatic rerouting of a call if the primary gateway is busy or unreachable?

Accepted Answer

Route List. A Route List provides ordered, prioritized routing by grouping multiple Route Groups and enabling automatic failover when the primary gateway is busy, unreachable, or returns an error. It is the CUCM component that delivers redundancy for outbound call routing.

Answer

Partition

Answer

Device Pool

Answer

Route Group

Question 9

You are troubleshooting a scenario where internal calls between two sites are failing. The call fails immediately when dialed. What is the most effective way to verify that the Calling Search Space (CSS) has access to the destination partition?

Accepted Answer

Use the Dialed Number Analyzer (DNA) tool.. The Dialed Number Analyzer (DNA) tool in Cisco Unified Communications Manager simulates a call from a specified calling device/DN to a dialed number, showing exactly which partitions, CSS, translation patterns, route patterns, and route lists are matched. It is the definitive tool for verifying whether a CSS has access to the destination partition and for pinpointing where dial plan processing fails.

Answer

Check the 'Route Filter' list.

Answer

Use the 'Route Pattern' report in Cisco Unified Reporting.

Answer

Reset the SIP trunk.

Question 10

A CUBE is configured for H.450.3 call forwarding, but it is not working. What is the most likely cause?

Accepted Answer

Incompatible signaling protocol. H.450.3 is a supplementary service for call diversion (call forwarding) defined within the H.323 protocol suite. For H.450.3 to function, the signaling protocol on the dial-peer must be H.323 — it cannot work over SIP or other signaling protocols because H.450.x supplementary services are H.323-specific constructs. If the CUBE is configured with SIP signaling on the relevant dial-peers, H.450.3 call forwarding will never trigger, making incompatible signaling protocol the most likely cause.

Answer

Dial-peer not defined

Answer

Codec mismatch

Answer

SIP profile missing

Question 11

You are troubleshooting a registration issue where the phone sends a REGISTER request, but the server does not respond. What is the most likely issue?

Accepted Answer

Network Connectivity/Firewall. If the phone sends a REGISTER request but the server does not respond at all, the most likely cause is a network connectivity or firewall issue blocking the traffic. If the server received the request, it would typically respond with a 401 Unauthorized challenge or a 200 OK. A complete lack of response indicates the packet is not reaching the server or the response is blocked.

Answer

Incorrect Model

Answer

Device Pool mismatch

Answer

Wrong Password

Question 12

Which THREE items are required to successfully register a room device to Webex?

Accepted Answer

A valid Webex Device license. Option A is correct because registering a room device to Webex requires a valid Webex Device license assigned to the device in Control Hub, which authorizes the device to use Webex cloud services. Option D is correct because the device must be onboarded using a valid activation code generated from Control Hub, which the device uses to authenticate and complete registration. Option E is correct because the device needs an active internet connection to reach Webex cloud endpoints and complete the cloud registration process. Options B and C are not required: a local SIP trunk and an existing CUCM registration are on-premises telephony concepts and are not prerequisites for Webex cloud device registration.

Answer

A local SIP trunk

Answer

An existing CUCM registration

Question 13

An administrator is deploying Webex Hybrid Calendar Service with an on-premises Microsoft Exchange 2019 environment. Users report that their Webex meetings are not being automatically added to their Outlook calendars. The administrator has already verified that the Expressway-C and Expressway-E connectors are registered and healthy in Control Hub. Which additional component must be installed and configured to enable the calendar integration?

Accepted Answer

Webex Hybrid Calendar Service connector (Calendar Connector) on a Windows server. Hybrid Calendar Service requires a dedicated Calendar Connector to integrate with the on-premises Exchange environment. The Expressway pair handles secure connectivity to the Webex cloud, but the Calendar Connector is the component that actually reads and writes Exchange calendar data to insert Webex meeting details. Without it, meetings will not appear on users' Outlook calendars even if the Expressway connectors are healthy.

Answer

Webex Hybrid Media Service node on the Expressway-C

Answer

Cisco Directory Connector on a domain-joined Windows server

Answer

Cisco Expressway-E with a public TLS certificate

Question 14

A company has deployed Webex Hybrid Message Service to integrate its on-premises Cisco Unified Communications Manager IM and Presence Service with Webex. Users complain that their presence status is not updating in Webex when they change it in the on-premises Jabber client. The administrator confirms that the Expressway-C and Expressway-E are registered and that the Hybrid Message Service connector is running. Which component should the administrator verify next to ensure presence federation is working?

Accepted Answer

Cisco Unified Communications Manager IM and Presence Service SIP federation configuration. Hybrid Message Service uses SIP federation to connect the on-premises IM and Presence Service with the Webex cloud. Presence information flows over this federation, so if presence updates are not appearing, the SIP federation configuration on IM and Presence is the most likely culprit. The Expressway connectors and Hybrid Message Service connector only provide the transport and service registration; they do not replace the need for correct SIP federation settings.

Answer

Cisco Unity Connection voicemail ports

Answer

Webex Control Hub user account license assignment

Answer

Cisco Expressway-C certificate trust store for HTTPS

Question 15

Which THREE of the following are necessary to ensure successful NTP deployment in a CUCM cluster?

Accepted Answer

Configure external Stratum 1 or 2 servers. Option B is correct because CUCM requires an external NTP source of good quality, and Stratum 1 or 2 servers provide the accurate, reliable time reference needed to keep all cluster nodes synchronized. Option C is correct because NTP communicates over UDP port 123, so any firewall between CUCM and the NTP servers must permit UDP 123 traffic or synchronization will fail. Option E is correct because every node in the CUCM cluster must point to the same consistent NTP configuration so that all servers share a common time source and avoid clock drift that could break database replication and certificate validation. Option A is not required because CUCM uses unicast NTP to reach specified servers, not broadcast mode. Option D is not required because enabling NTP on a local voice gateway is unrelated to CUCM cluster time synchronization.

Answer

Use broadcast mode

Answer

Enable NTP on the local voice gateway