Cisco · Free Practice Questions · Last reviewed May 2026
36real exam-style questions organised by domain, each with the correct answer highlighted and a plain-English explanation of why it's right — and why the others are wrong.
What is the default dial-peer used if no other dial-peer matches a call on a Cisco IOS XE gateway?
Dial-peer 0
Dial-peer 0 is the default catch-all.
Dial-peer none
Dial-peer 1
Dial-peer 100
You are deploying CUBE. Which command enables the CUBE functionality on the Cisco IOS XE router?
enable cube
mode border-element
This is the required command to activate CUBE.
voice-service enable
service cube
A Cisco IOS XE gateway is failing to route calls because the dial-peer is not matching the incoming call. Which command helps you identify the dial-peer that matched the incoming call?
show voice call status
show dial-peer voice summary
debug ccsip messages
debug voip dialpeer all
This command traces the dial-peer selection process.
You are configuring CUBE for SIP-to-SIP header manipulation. You need to remove the Diversion header from outgoing INVITE requests. Which component is required to achieve this?
voice class sip-profiles
SIP profiles allow for precise header removal or modification.
dial-peer voice
voice class codec
voice translation-rule
When configuring CUBE for media flow-around, which command ensures the media goes directly between endpoints?
media flow-around
This allows direct end-to-end media.
media pass-through
media-bypass
media flow-through
What is the primary function of a dial-peer destination-pattern?
To define the codec
To specify the gateway IP
To match the dialed number
destination-pattern matches the called number.
To enable SIP
Want more Voice Gateways And Session Border Controllers practice?
Practice this domainWhich TWO steps are required to successfully deploy the Webex Hybrid Calendar service with Microsoft Exchange?
Create an impersonation role in Exchange
Impersonation allows the connector to access user calendars.
Configure an H.323 gatekeeper
Enable Webex Meetings on the local CUCM
Disable Active Directory integration
Deploy the Calendar Connector on a Virtual Machine
The connector node must be hosted on-premises or in a virtual environment.
You are troubleshooting a scenario where users in a Hybrid Calendar deployment cannot see free/busy information for their on-premises Exchange resources. Which tool in Control Hub provides the most granular logs for the Hybrid Calendar service?
Hybrid Service Connector Status Logs
Connector logs are the primary diagnostic tool for hybrid services.
Exchange EWS Connectivity Test
Control Hub Analytics Dashboard
Webex Calling Provisioning Report
A customer is migrating from CUCM to Webex Calling and requires the same extension numbers to be used across both environments simultaneously. Which feature facilitates this?
Hybrid Call Service Aware
Dial Plan with PSTN Failover
Migration Assistant Tool
Directory Sync with CUCM Integration
Syncing ensures the directory reflects the hybrid state required for overlapping extensions.
An administrator needs to enable Hybrid Calendar Service for a user who uses Microsoft Exchange 2019 on-premises. Which service component must be deployed to facilitate the integration?
Expressway-C Calendar Connector
The Calendar Connector resides on the Expressway-C and interacts with Exchange.
Hybrid Media Node
Webex Calling Gateway
Webex Edge Node
You are configuring a Webex Calling environment for a customer that requires integration with an existing on-premises PBX using a Cisco Unified Border Element (CUBE). Which gateway type should you register to Webex Control Hub to enable this connectivity?
Cloud Connected PSTN Gateway
Local Gateway
Local Gateways allow SIP trunk connectivity between Webex Calling and on-premises equipment.
Webex Edge Connect Gateway
Virtual Gateway
You are deploying Webex Calling with Local Gateway. Which component must be configured to allow PSTN connectivity for users who have migrated from on-premises CUCM to the cloud?
Webex Edge Connect
SIP Trunk via Local Gateway
Local Gateway is the architectural component required for local PSTN access.
Webex Calling Cloud Connected PSTN
Unified Border Element (CUBE) API
Want more Cloud And Hybrid Services practice?
Practice this domainWhich TWO configuration steps must be completed to ensure proper redundancy for a CUCM group? (Select TWO)
Configure a separate SIP trunk for each node
Create a new partition for each node
Assign the Device Pool to the device
The device must inherit the group via the Device Pool.
Assign the CUCM group to the Device Pool
The group definition is applied via the Device Pool.
Enable Heartbeat on the physical switch
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?
Increase the 'Maximum Number of MTP Resources' in the Service Parameters.
Change the SIP Trunk Security Profile to 'Non-Secure' to bypass encryption negotiation.
Check the MTP Required checkbox on the SIP trunk configuration and ensure the MRGL includes an MTP resource.
Enabling MTP Required forces the CUCM to allocate an MTP resource for the call, resolving codec negotiation issues.
Modify the Region settings to force G.711 codec between the two sites.
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?
Media Resources > Conference Bridge
System > Service Parameters
Device > Trunk > Transformation CSS
Device > Phone > CSS
This is the primary location for setting the CSS for the device.
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?
Retry Count
SIP Rel1XX Options
Enabling this ensures CUCM handles reliable provisional responses.
Disable Early Media on 180
SIP Timer T1
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?
The device is not assigned to a Device Pool with the correct Location configured for the new site.
The device must be associated with a Device Pool that maps to the physical location of the site to calculate CAC correctly.
The Region setting in the Device Pool has a lower bitrate than the required codec.
The device must be re-registered to a local subscriber instead of the primary cluster.
The Calling Search Space is not configured to allow inter-site dialing.
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?
Device > Device Settings > Common Device Configuration
System > Region Information > Region
The Region matrix allows you to define the maximum audio bit rate between specific regions.
System > Device Pool
System > Location
Want more ON Premises Call Control practice?
Practice this domainA Webex Desk Pro is failing to provision via the Cisco Webex Control Hub. The device displays 'Provisioning Error'. Which configuration component is primarily responsible for holding the authentication credentials required for the device to pull its configuration?
Activation Code
The activation code is the primary method for secure onboarding.
TFTP Address
SIP Digest User
VLAN ID
An endpoint sends a SIP REGISTER request. CUCM returns a 401 Unauthorized response. What is the next logical step in the SIP signaling flow for the endpoint?
Switch to SCCP
Resend REGISTER with Authorization header
The endpoint must respond to the challenge with credentials.
Terminate the TCP connection
Send a SIP INVITE
When configuring an IP phone for automatic provisioning, which DHCP option is most commonly used to provide the TFTP server address to the phone?
Option 150
Option 150 is the industry standard for Cisco voice devices.
Option 43
Option 66
Option 12
An endpoint using the Opus codec is experiencing one-way audio. The SDP exchange indicates that the endpoint is offering a wideband range. Where in CUCM would you modify the Region settings to force the use of a specific codec for this endpoint?
Service Parameters
Device Pool
SIP Profile
Region Settings
Regions define the max audio bit rate used between endpoints.
A Cisco IP Phone 8841 is failing to register to Cisco Unified Communications Manager. You check the phone settings and see the TFTP server address is correct. Which protocol and port should you monitor on the gateway or firewall to verify the initial registration attempt?
SCCP 2000
SIP UDP 5060
SIP registration occurs over 5060 by default.
TFTP 69
HTTP 8080
You are troubleshooting a scenario where G.711 is being used instead of the expected Opus codec between two endpoints in the same region. What is the most likely cause in the CUCM configuration?
Audio Codec Preference List
The codec preference list dictates the order and availability of codecs.
Phone NTP settings
SIP Trunk Security Profile mismatch
Location-based bandwidth limit
Want more Protocols And Endpoints practice?
Practice this domainA network engineer is deploying Cisco Unified Border Element (CUBE) and must ensure that voice traffic is prioritized correctly across the enterprise network. Which command correctly maps the voice traffic DSCP value to the correct priority queue in a Cisco IOS-XE router?
class-map match-any VOICE; match protocol sip; policy-map VOICE-POLICY; class VOICE; queue-limit 100
class-map match-all VOICE; match dscp cs4; policy-map VOICE-POLICY; class VOICE; bandwidth 1000
class-map match-any VOICE; match dscp ef; policy-map VOICE-POLICY; class VOICE; fair-queue
class-map match-any VOICE; match dscp ef; policy-map VOICE-POLICY; class VOICE; priority 1000
This sequence correctly identifies voice traffic and assigns it to the strict priority queue.
In a Cisco collaboration design, you are tasked with identifying the DHCP Option required for Cisco IP Phones to discover the TFTP server address automatically. Which option is standard for this purpose?
Option 66
Option 128
Option 150
This is the required option for Cisco Unified IP Phone TFTP discovery.
Option 43
When designing an NTP deployment for a Cisco Collaboration environment, what is the best practice for time synchronization across CUCM nodes?
Point all CUCM nodes to the same external NTP stratum 1 or 2 servers.
Consistency is vital to prevent database replication failures.
Configure NTP only on the publisher node.
Point each CUCM node to a different NTP server for redundancy.
Use the publisher as the NTP server for all subscriber nodes.
Which design principle must be followed when implementing a centralized call processing deployment with remote branch offices connected via a WAN?
Enable SRST on the local branch gateway to handle call processing during a WAN outage.
SRST provides local call control when the WAN link to the central CUCM cluster is lost.
Deploy a dedicated CUCM node in every branch office.
Configure H.323 gateways at each site to communicate directly with all remote phones.
Use RSVP to guarantee bandwidth across the WAN for signaling.
You are configuring DNS SRV records to support Jabber service discovery. Which domain format is correct for the _collab-edge._tls record?
_tls._collab-edge.example.com
collab-edge.example.com._tls
_collab-edge._tcp.example.com
_collab-edge._tls.example.com
This is the correctly formatted SRV record for MRA discovery.
Which network condition is the most significant contributor to poor voice quality in a VoIP environment?
Low CPU usage on the router
Static IP addresses
Jitter
Jitter causes audio gaps and garbled sounds that jitter buffers struggle to correct.
High bandwidth usage
Want more Infrastructure And Design practice?
Practice this domainWhich command allows an administrator to view the current status of registered media resources, such as transcoders, on a Cisco IOS gateway?
show dial-peer voice
show sccp
This command shows the status of SCCP-registered media resources.
show media resources
show voice gateway status
You are implementing a QoS policy on a WAN edge router. You have a requirement to prioritize video traffic. Which queueing mechanism is recommended by Cisco to minimize jitter and latency for video streams?
Weighted Fair Queuing (WFQ)
Priority Queuing (PQ) only
Random Early Detection (RED)
Low Latency Queuing (LLQ)
LLQ is the industry standard for handling real-time video/voice traffic.
In a Cisco Collaboration environment, what is the purpose of the 'Media Termination Point' (MTP) in relation to call signaling?
To limit the bandwidth consumed by a call.
To provide codec transcoding services.
To provide DTMF interworking between endpoints.
MTPs are essential for resolving DTMF mismatches between different signaling protocols.
To cache video streams for faster playback.
A network administrator is troubleshooting one-way audio issues between a Cisco IP Phone and a Cisco TelePresence endpoint. The path traverses a router with a configured class-map. Which command would you use to verify the packet markings on the ingress interface?
show class-map configuration
show ip rtp statistics
show qos interface
show policy-map interface
This command displays the statistics for the policy map applied to the interface, including marking actions.
You are configuring a Media Resource Group List (MRGL) in CUCM to allow for transcoding. A call is placed between two endpoints where one supports G.711 and the other only supports G.729. If the MRGL contains a Transcoder, what must be configured to ensure the call succeeds?
Configure a Transcoder profile on the IOS gateway and assign it to the device pool's MRGL.
Transcoders must be associated with the device's MRGL to be invoked during media negotiation.
Set the Region codec to 'G.711 to G.729' explicitly.
Enable 'Allow Transcoding' in the Service Parameters.
Configure the IOS gateway as a Media Termination Point (MTP) only.
What is the default behavior for DSCP markings on traffic originating from a Cisco IP Phone that has not been configured with specific QoS policies?
Marked as DSCP 34 (AF41)
Traffic is not marked until a policy-map is applied
Marked as DSCP 46 for voice and CS3 for signaling
This is the factory default behavior for Cisco IP Phones.
Marked as DSCP 0 (Best Effort)
Want more Media And Qos practice?
Practice this domainThe CLCOR exam has 200 questions and must be completed in 120 minutes. Cisco passing scores vary by exam version and are not always publicly listed. Check the official Cisco exam page before booking.
CLI output interpretation, network topology analysis, routing behaviour, switching concepts, troubleshooting, and configuration questions.
The exam covers 6 domains: Voice Gateways And Session Border Controllers, Cloud And Hybrid Services, ON Premises Call Control, Protocols And Endpoints, Infrastructure And Design, Media And Qos. Questions are weighted by domain — higher-weight domains appear more on your actual exam.
No. These are original exam-style practice questions written against the official Cisco CLCOR exam objectives. They are not copied from the real exam. Courseiva focuses on genuine understanding, not memorisation of braindumps.
Courseiva tracks your accuracy per domain and routes you toward weak areas automatically. Free, no account required.