263 questions total · 4pages · All types, answers revealed
When configuring CUBE, why would you use a 'voice class uri' command?
This allows matching based on the SIP URI.
Why this answer
Voice class URI is used to match incoming SIP requests based on the URI, such as the host portion of the SIP message.
Which THREE items are required to successfully register a room device to Webex?
Required to enable the device in the cloud.
Why this answer
An activation code, network access, and the device license are fundamental requirements.
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?
Syncing ensures the directory reflects the hybrid state required for overlapping extensions.
Why this answer
Directory synchronization and specific routing patterns allow for extension overlapping during a phased migration.
You are observing that video traffic is marked as DSCP 0. How can you fix this at the network level without changing the endpoint configuration?
This is a standard method to correct markings for endpoints that do not mark traffic correctly.
Why this answer
A policy-map can be applied to the ingress port to classify the traffic based on ACLs and then re-mark it with the appropriate DSCP value.
Which TWO actions are required to successfully add a new media resource, such as a Conference Bridge, to CUCM?
The device must be defined in the system.
Why this answer
Adding a conference bridge requires both registering the device (or configuring the software bridge) and adding it to a Media Resource Group (MRG) for it to be usable.
Which TWO features are provided by the Cisco Webex App when registered as a Softphone?
Required for call control.
Why this answer
Webex provides softphone signaling (SIP) and audio/video media capabilities.
Which field in the SIP INVITE SDP body specifies the media attributes such as codec type?
'm=' defines the media stream and codec attributes.
Why this answer
The 'm=' (media) line specifies the media type, port, protocol, and codec information.
In CUCM, what is the purpose of the 'Calling Search Space' (CSS)?
CSS provides access control to partitions.
Why this answer
The CSS is a list of partitions that a device or line can access to search for dialable patterns.
You are implementing a centralized dial plan. You have multiple sites, each with local PSTN gateways. How can you ensure that an emergency call from a specific site is always routed to the local PSTN gateway of that site?
This ensures the emergency call matches the local gateway route pattern specifically.
Why this answer
By using a combination of Partitions and CSS, you can ensure that the emergency route pattern is reachable by all, but the specific route pattern matches the local gateway's partition.
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?
The mailbox must be explicitly enabled for the service to parse the invite.
Why this answer
The Hybrid Calendar Service requires the meeting host to be enabled for the service and the invite to contain specific URI information that the calendar connector parses to generate the join button.
You are implementing Webex Calling with a Local Gateway. The requirement is to maintain internal dial plan transparency for existing extension-to-extension dialing. What must you configure?
This ensures extensions map correctly between environments.
Why this answer
To maintain dialing transparency, the dial plan must be synchronized or normalized between the local gateway and the Webex Calling cloud dial plan.
You need to migrate users from an on-premises Cisco Unified Communications Manager (CUCM) to Webex Calling. Which tool allows for the bulk onboarding of users while maintaining existing directory synchronization?
CSV templates in Control Hub provide the bulk onboarding mechanism.
Why this answer
The Webex Directory Connector or SCIM integration is used to sync, but the Webex Control Hub 'Users' management tool is the primary interface for bulk migration assignments.
You are implementing a SIP trunk to the PSTN. The carrier requires the 'Diversion' header for call forwarding scenarios. Where in CUCM do you configure this?
SIP Profiles manage headers and signaling behavior for SIP trunks.
Why this answer
The SIP Profile is the correct location to enable the redirection of headers like Diversion, which is required for proper call forwarding identification.
What is the primary function of a dial-peer destination-pattern?
destination-pattern matches the called number.
Why this answer
The destination-pattern defines the number or pattern that triggers the selection of a specific dial-peer.
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?
The endpoint must respond to the challenge with credentials.
Why this answer
The 401 response challenges the endpoint to provide credentials (Digest authentication). The endpoint must resend the REGISTER request with the Authorization header.
You are designing a network for video collaboration. What is the recommended maximum one-way latency for high-quality video conferencing?
150ms is the industry-standard threshold for real-time media.
Why this answer
For high-quality, real-time video conferencing, one-way latency must be kept below 150ms to ensure a good user experience.
Which protocol does the Webex Hybrid Message service use to communicate with the on-premises IM&P server?
XMPP is the industry standard for instant messaging and presence exchange.
Why this answer
The Hybrid Message Service uses the Extensible Messaging and Presence Protocol (XMPP) to communicate between the IM&P server and the Webex cloud.
When deploying Cisco IP phones, what is the best practice for VLAN configuration?
Separating voice from data is a fundamental design best practice.
Why this answer
Phones should be placed in a dedicated Voice VLAN for security and QoS performance reasons.
SIP registration occurs over 5060 by default.
What is the primary function of the CUBE in a SIP trunking scenario?
This is the core function of the CUBE.
Why this answer
The CUBE (Cisco Unified Border Element) acts as a demarcation point between the enterprise network and the service provider, handling SIP normalization, media relay, and security.
When a call is made to a destination that matches multiple partitions in a user's CSS, how does CUCM determine which pattern to use?
CUCM prioritizes the most specific pattern match.
Why this answer
CUCM selects the most specific match first. If multiple patterns are equally specific, it uses the first one found in the search space order.
A user reports that they cannot hold an active call when the Media Resource Group List (MRGL) is configured with a specific Transcoder. The CUCM trace shows 'Allocation Failure'. What is the most likely cause?
If a transcoder is not available in the assigned MRG, the call will fail to negotiate media.
Why this answer
Allocation failure usually indicates that the hardware transcoder resource is exhausted or unreachable, requiring a check of the MRGL priority and resource availability.
Which TWO tasks must be performed when moving a phone from one CUCM cluster to another?
Reset forces the phone to re-download the config from the new server.
Why this answer
You must change the TFTP server address and potentially reset the device to clear the old registration data.
Which THREE of the following are necessary to ensure successful NTP deployment in a CUCM cluster?
Required for reliable time source.
Which THREE of the following are key features provided by a QoS policy-map?
Bandwidth allocation is a primary function of policy-maps.
Why this answer
Policy-maps define the traffic treatment, such as bandwidth assignment, queueing, and dropping policies.
Which TWO of the following are essential components of a Cisco network readiness assessment for collaboration?
Essential to ensure sufficient headroom for voice/video.
Why this answer
Assessing existing bandwidth capacity and ensuring QoS settings are correctly applied are the two primary foundations for a network readiness assessment.
Which license type is required to manage Webex Calling services in Control Hub?
This provides the necessary feature set for cloud calling.
Why this answer
The Webex Calling service license must be assigned to the user or organization to enable PSTN and calling features.
What is the function of a 'Device Pool' in CUCM?
Device pools centralize common configuration settings.
Why this answer
A Device Pool is a collection of device-specific configuration settings like location, date/time, and CM group, which can be applied to devices in bulk.
Which THREE types of media resources can be managed by an MRGL?
Used for codec matching.
Why this answer
Common media resources include music on hold, conference bridges, and transcoders, all of which are managed via MRGs and MRGLs.
Which THREE items are included in a standard SIP REGISTER request?
Target user/address.
Why this answer
The 'To', 'From', and 'Contact' headers are mandatory in a SIP REGISTER request.
Which THREE of the following tasks are required to set up a basic SIP trunk in CUCM?
Needed for security/authentication settings.
Why this answer
Setting up a SIP trunk requires a Security Profile, a SIP Profile, and the trunk device itself.
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?
Local Gateways allow SIP trunk connectivity between Webex Calling and on-premises equipment.
Why this answer
Local Gateways are used to connect on-premises PSTN or PBX systems to Webex Calling via a CUBE.
Which TWO items are required to configure an 'Application Dial Rule'?
The rule needs a pattern to trigger.
Why this answer
Application Dial Rules require a pattern match and a target string to transform numbers for directory lookups or click-to-call.
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?
Local Gateway is the architectural component required for local PSTN access.
Which CUCM feature allows an administrator to automatically register new phones using a pre-defined device template?
Auto-registration enables quick deployment.
Why this answer
'Auto-Registration' allows phones to join the cluster without manual configuration if the 'Auto-Registration' range is configured in the CUCM system parameters.
If a Translation Pattern is configured in CUCM, at what stage of the call processing does the digit manipulation occur?
Translation patterns are processed before route patterns to modify digits prior to final routing.
Why this answer
Translation Patterns act as a mid-call processing step. When a digit string is dialed, CUCM checks for Translation Patterns before checking Route Patterns.
Which TWO actions help secure the communication between the CUCM and the IP phones?
These files establish trust between the phone and CUCM.
Why this answer
Securing phone communication involves both the certificate-based trust (ITL/CTL) and the configuration of encrypted profiles.
Which TWO of the following are required to successfully register a CUBE with a SIP provider?
Credentials are required for registration authentication.
Why this answer
CUBE registration requires a SIP-UA configuration defining the authentication credentials and the registrar server.
An administrator needs to restrict a group of phones from making long-distance calls. Which component of the CUCM dial plan should be modified to achieve this while maintaining internal dialing?
Restricting access by modifying the CSS assigned to the device is the standard approach.
Why this answer
Partition and Calling Search Space (CSS) configuration is the primary method to restrict access to specific route patterns by assigning them to different partitions.
You are configuring a Cisco IOS router to perform traffic shaping for voice traffic. Why is traffic shaping often used in conjunction with queuing?
Shaping regulates traffic flow to conform to a specific rate, preventing congestion.
Why this answer
Traffic shaping smooths out bursts of traffic, preventing the buffer overflows that would lead to packet loss and poor voice quality.
You are configuring a hybrid calling scenario. Which component must be configured to enable inter-cluster dialing between on-premises CUCM and Webex Calling?
The SIP trunk facilitates the routing of calls between the local environment and the cloud.
Why this answer
A SIP Trunk between the CUCM cluster and the Webex Calling cloud (via a CUBE) is required to route calls between the two environments.
Which service allows Webex users to see the presence status of an on-premises Jabber user?
This is the dedicated service for presence interop.
Why this answer
The Hybrid Presence Service enables the exchange of presence status between the cloud-based Webex platform and the on-premises Cisco Unified Communications Manager IM and Presence (IM&P) service.
Which THREE components are involved in the Webex Hybrid Media Service architecture?
Used to host the connector.
Why this answer
The architecture relies on Expressway-C, Media nodes, and the cloud-based management platform.
Which tool can be used to perform a bulk import of users and devices into CUCM?
BAT is used for bulk provisioning.
Why this answer
The Bulk Administration Tool (BAT) is the standard method for large-scale imports of devices, users, and dial plan objects.
When designing an NTP deployment for a Cisco Collaboration environment, what is the best practice for time synchronization across CUCM nodes?
Consistency is vital to prevent database replication failures.
Why this answer
CUCM nodes must point to the same reliable external Stratum 1 or 2 NTP servers to ensure call logs and security certificates remain synchronized.
Which menu path in CUCM Administration is used to configure the 'Cisco Unified Communications Manager Group'?
This is the correct navigation path.
Why this answer
The CM Group is found under 'System -> Cisco Unified Communications Manager Group'.
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?
Enabling MTP Required forces the CUCM to allocate an MTP resource for the call, resolving codec negotiation issues.
Why this answer
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.
You are troubleshooting a registration failure for a remote IP phone. The phone is configured to use an Expressway-E for MRA. Which DNS record is queried by the client to find the Expressway-E cluster?
This SRV record is used by external clients to discover the Expressway-E.
Why this answer
The _collab-edge._tls DNS SRV record is the first step in the MRA discovery process to locate the Expressway-E.
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?
SIP profiles allow for precise header removal or modification.
Why this answer
A SIP profile is required to match and modify or remove specific SIP headers in CUBE.
Which component in a Cisco Collaboration design is responsible for providing the dial tone and call routing logic for IP phones?
CUCM serves as the call processing agent.
Why this answer
CUCM (Cisco Unified Communications Manager) is the primary call control agent responsible for call processing, routing, and device management.
Which THREE of the following are required DNS records for a successful Cisco MRA (Mobile and Remote Access) deployment?
Used for clients to find the UDS service on CUCM.
Why this answer
MRA relies on SRV records for discovering the Expressway-E, the Collab-Edge TLS record for discovery, and the UDS service record for user settings.
You are configuring Webex Hybrid Calendar with Microsoft 365. You want to ensure that 'Join' buttons appear on video devices for meetings. What must be configured?
For OBTP to work, the device must be known to the cloud platform hosting the calendar service.
Why this answer
The 'One Button to Push' (OBTP) feature relies on the Hybrid Calendar service parsing the meeting invite and sending the join info to the device.
Option 150 is the industry standard for Cisco voice devices.
Which THREE of the following are valid reasons to use a Media Termination Point (MTP)?
MTPs can act as a bridge for protocol-specific signaling needs.
Why this answer
MTPs are used for DTMF conversion, protocol bridging, and codec/media type compatibility.
Which THREE of the following troubleshooting steps should be performed if a Webex Hybrid connector is showing 'Down' in Control Hub? (Choose three)
Restarting the service can resolve transient process issues.
Why this answer
When a connector fails, the administrator should verify network connectivity, check the service status on the Expressway, and examine the local logs for errors.
You are troubleshooting a one-way audio issue. The phone can register, but no audio is heard. What should you check first?
Blocked media ports often cause one-way audio.
Why this answer
One-way audio is typically a network connectivity issue, such as blocked RTP ports or an incorrect Media Resource configuration.
Which feature in CUCM is used to block calls when the available bandwidth in a location is exceeded?
Locations CAC is the standard feature for limiting bandwidth in CUCM.
Why this answer
Location-based Call Admission Control (CAC) is the native feature in CUCM that restricts calls when bandwidth limits are reached.
When deploying Webex Hybrid Services, what is the purpose of the Expressway-C cluster?
Expressway-C is the host for all hybrid service connectors.
Why this answer
The Expressway-C cluster acts as the secure gateway and connector host that bridges on-premises services to the Webex cloud.
You have implemented 'Local Route Group' in your dial plan. What is the main advantage of using this instead of static Route Groups?
It uses the Device Pool to select the local egress gateway dynamically.
Why this answer
Local Route Groups decouple the dial plan from the specific gateway, allowing the same route pattern to route via different local gateways based on the device's Device Pool.
Which THREE of the following items are considered part of the 'Cisco Unified Communications Manager' infrastructure redundancy model?
Groups redundant settings.
Why this answer
Redundancy is provided by the CM Group, Device Pool (which points to the CM Group), and the Subscriber node design.
Which TWO of the following are common audio codecs used in Cisco collaboration?
G.711 is the standard uncompressed codec.
Why this answer
G.711 and G.729 are the most ubiquitous codecs in Cisco voice deployments.
You need to ensure that an encrypted call is established between two phones. Which component must be properly configured for 'Mixed Mode' to support secure media (SRTP)?
The presence of a valid CTL/ITL file is mandatory for encrypted signaling and media.
Why this answer
To support SRTP, the CUCM must be in 'Mixed Mode', which is typically enabled via the 'utils ctl update' or 'utils security set' CLI commands.
You are implementing a 'Call Hunt' sequence. You want to ensure that if no agent answers within 20 seconds, the call moves to the next member in the list. Which configuration object manages this timer?
Line Groups contain the ring duration timer.
Why this answer
The 'Line Group' configuration allows you to set the 'No Answer Ring Duration' which dictates how long a phone rings before the call is routed to the next member.
An administrator needs to enforce a bandwidth limit for video calls at a specific site in CUCM. Which configuration object should be used?
Locations are the primary mechanism for CAC (Call Admission Control) and bandwidth management.
Why this answer
Locations in CUCM are used to define available bandwidth for audio and video calls at a specific geographic site.
Which TWO of the following are true regarding the use of voice translation-rules?
Regex is the engine for pattern matching.
Why this answer
Translation rules use regular expressions to match and replace digits.
Which statement best describes the difference between policing and shaping?
Policing is an aggressive drop mechanism; shaping is a smoothing mechanism.
Why this answer
Policing drops traffic that exceeds the limit, while shaping buffers the excess traffic to smooth out the flow.
Which command is used to configure the IP address or hostname of the destination device on a dial-peer?
This defines where to send the call.
Why this answer
session target ipv4:x.x.x.x is the standard way to define the destination IP.
Which TWO of the following fields are required when defining a Route Pattern?
The destination for the pattern match.
Why this answer
To define a route pattern, you must specify the pattern string itself and the destination (Gateway or Route List).
When adding a new phone, what is the 'Device Name' parameter based on by default?
The 'SEP' prefix plus the MAC address is the standard.
Why this answer
The device name is derived from the MAC address of the phone in the format 'SEP' followed by the MAC address.
You are troubleshooting a Webex Hybrid Calendar issue where meetings are missing for a specific user. What tool can you use to check the 'Calendar API' calls?
This page displays real-time logs of the API calls being made to the exchange server.
Why this answer
The 'Calendar Connector' status page in the Expressway provides an interface to view recent API requests and responses to the calendar server, which is essential for troubleshooting synchronization issues.
You are troubleshooting high latency for Webex media. Which tool in Control Hub provides the best visibility into the path taken by the media packets?
This dashboard monitors latency, jitter, and packet loss for calls.
Why this answer
The 'Webex Calling Media Quality' dashboard or the 'Troubleshooting' section in Control Hub provides detailed metrics on hop-by-hop latency.
You are configuring Webex Hybrid Message Service. What is the primary purpose of this service?
This service bridges the IM&P environment with the cloud-based Webex messaging environment.
Why this answer
The Hybrid Message Service allows interoperability between on-premises Cisco Unified Communications Manager (IM and Presence) and the Webex App.
An IP phone is stuck in a boot loop. You suspect a corrupted firmware image. Which process would you initiate to force the phone to download a new image?
Factory reset clears local settings and forces a re-download of firmware.
Why this answer
Performing a 'Factory Reset' or updating the 'Load Information' in the Device configuration in CUCM will trigger a forced update.
What is the result of applying 'voice translation-profile' to an incoming dial-peer?
Translation profiles modify digit patterns.
Why this answer
Translation profiles modify incoming or outgoing digits (calling or called numbers) to fit the dial plan.
A user is unable to use their 'Speed Dial' button. What is the first thing you should verify?
The template must have the speed dial feature enabled on the specific key.
Why this answer
Speed dials are assigned to specific buttons or configured via the User Options page; checking the 'Phone Button Template' is the first step in troubleshooting the button assignment.
Practice CLCOR by domain
Target a specific domain to shore up weak areas.