- CLCOR Domain Overview at a Glance
- Domain 1: Infrastructure and Design (15%)
- Domain 2: Protocols and Endpoints (10%)
- Domain 3: On-Premises Call Control (30%)
- Domain 4: Voice Gateways and Session Border Controllers (10%)
- Domain 5: Cloud and Hybrid Services (25%)
- Domain 6: Media and QoS (10%)
- Turning Domain Weights Into a Study Plan
- Question Format and Exam Logistics
- Who Actually Hires for These Skills
- Frequently Asked Questions
- On-Premises Call Control carries 30% of the exam - the single heaviest domain on the blueprint.
- Cloud and Hybrid Services is the second-largest domain at 25%, covering Webex Calling and Control Hub.
- The current blueprint is version 2.0, effective February 3, 2026, tested over 120 minutes.
- Exam fee is US$400 plus tax; Cisco Learning Credits are accepted at registration.
CLCOR Domain Overview at a Glance
Implementing and Operating Cisco Collaboration Core Technologies (350-801), commonly shortened to CLCOR, is built from six content areas that together define the core skill set Cisco expects from a collaboration engineer. Cisco publishes these weights on the official exam blueprint, and understanding them precisely - not approximately - is the difference between an efficient study plan and one that wastes weeks on low-yield topics.
The six domains and their official weighting are:
| Domain | Weight | Primary Focus |
|---|---|---|
| 1. Infrastructure and Design | 15% | NTP, DHCP, DNS, codecs, network readiness for voice/video |
| 2. Protocols and Endpoints | 10% | SIP signaling, RTP/RTCP, endpoint registration behavior |
| 3. On-Premises Call Control | 30% | CUCM call routing, dial plans, Unity Connection |
| 4. Voice Gateways and Session Border Controllers | 10% | PSTN interconnect, CUBE, SBC functions |
| 5. Cloud and Hybrid Services | 25% | Webex Calling, Control Hub, hybrid provisioning, cloud APIs |
| 6. Media and QoS | 10% | QoS marking, media resources, bandwidth management |
If you're still mapping out how these domains fit into a broader prep strategy, the CLCOR Study Guide 2026: How to Pass on Your First Attempt walks through a first-attempt strategy that pairs directly with this domain breakdown.
Domain 1: Infrastructure and Design (15%)
This domain establishes the network and design foundation that every other domain builds on. Candidates need to understand how underlying network services - NTP synchronization, DHCP scope design for phones, DNS resolution for endpoints - directly affect call control reliability.
Infrastructure and Design
Expect questions on network readiness assessment, codec selection trade-offs, and design decisions that support voice and video quality at scale.
- Codec bandwidth and quality trade-offs (G.711, G.729, video codecs)
- NTP, DHCP, and DNS dependencies for endpoint registration
- High-level collaboration deployment models and their design implications
Domain 2: Protocols and Endpoints (10%)
This domain tests protocol-level fluency - the mechanics candidates need to troubleshoot in production. SIP dominates here, since it underpins call setup between endpoints, gateways, and cloud services throughout the rest of the exam.
Protocols and Endpoints
Focus on SIP message flow, endpoint registration states, and the media transport protocols that carry voice and video once a call is established.
- SIP request/response methods and call setup sequencing
- RTP and RTCP roles in media transport
- Endpoint registration, provisioning, and firmware behavior
Domain 3: On-Premises Call Control (30%)
At 30%, this is the largest single domain on the CLCOR blueprint and deserves the largest share of study time by a clear margin. It centers on Cisco Unified Communications Manager (CUCM) call routing logic and Cisco Unity Connection voicemail integration - the two systems most collaboration engineers touch daily.
On-Premises Call Control
This is where dial plan design, call routing components, and Unity Connection integration converge. Candidates should be comfortable tracing a call from digit entry through route patterns to final delivery.
- CUCM call routing: route patterns, route groups, route lists, translation patterns
- Calling privileges, partitions, and calling search spaces
- Unity Connection integration and voicemail call handling
- Media resource groups and their role in call routing decisions
Key Takeaway
Because this domain is worth nearly a third of the exam, build hands-on CUCM dial plan labs into your prep rather than relying on reading alone - route pattern logic is best learned by tracing real call flows.
For a granular look at what "passing" actually requires across a domain this heavy, see CLCOR Passing Score 2026: Exactly What You Need to Pass.
Domain 4: Voice Gateways and Session Border Controllers (10%)
This domain covers how on-premises call control connects outward to the PSTN and to other SIP trunks. Cisco Unified Border Element (CUBE) functionality and general SBC concepts are the anchor topics.
Voice Gateways and SBCs
Understand the role gateways play in protocol interworking, PSTN failover, and security at the network edge.
- CUBE deployment models and SIP trunking to service providers
- Digit manipulation and dial-peer matching logic on gateways
- SBC functions: topology hiding, protocol normalization, security
Domain 5: Cloud and Hybrid Services (25%)
The second-heaviest domain reflects how much collaboration deployments have shifted toward cloud and hybrid models. Webex Calling and Control Hub administration sit at the center, alongside the cloud APIs and provisioning workflows that connect on-premises systems to cloud services.
Cloud and Hybrid Services
Expect scenario-based questions on hybrid architecture decisions, user provisioning across on-prem and cloud, and Control Hub configuration tasks.
- Webex Calling architecture and call flow
- Control Hub administration: user management, locations, and licensing
- Hybrid services connecting CUCM environments to cloud collaboration
- Cloud APIs used for provisioning and integration tasks
Domain 6: Media and QoS (10%)
The final domain ties infrastructure design back to media quality. Candidates need to understand how QoS markings preserve voice and video quality across a converged network and how media resources are allocated during call setup.
Media and QoS
Focus on end-to-end QoS marking consistency and the media resource types CUCM uses to bridge, transcode, or conference calls.
- DSCP marking and trust boundaries for voice/video traffic
- Media resource groups and media resource group lists
- Bandwidth management for conferencing and video calls
Turning Domain Weights Into a Study Plan
Generic study techniques like spaced repetition work best when they're mapped onto CLCOR's actual weighting rather than applied evenly. A practical sequencing approach front-loads the heaviest domains while leaving review time before test day.
On-Premises Call Control (30%)
- Build and trace CUCM dial plans hands-on
- Study Unity Connection call handling scenarios
Cloud and Hybrid Services (25%)
- Practice Control Hub administration tasks
- Review Webex Calling provisioning workflows
Infrastructure, Protocols, Gateways, Media/QoS
- Rotate through the four remaining 10-15% domains
- Drill SIP call flows and QoS marking scenarios
Full Review
- Run timed practice questions across all six domains
- Revisit weak areas identified during review
This sequencing logic is expanded further in the CLCOR Study Guide, and if you're unsure how much total effort to budget, How Hard Is the CLCOR Exam? Complete Difficulty Guide 2026 breaks down where most candidates lose time.
Question Format and Exam Logistics
CLCOR is a closed-book, computer-based exam delivered in English through Pearson VUE test centers or via OnVUE online proctoring. The exam runs 120 minutes and uses multiple-choice, drag-and-drop, and possible performance-based lab items - meaning some questions may require configuring or troubleshooting a simulated environment rather than just selecting an answer.
- Exam fee: US$400 plus applicable tax; Cisco Learning Credits are accepted
- Prerequisites: None formally required
- Blueprint version: v2.0, effective February 3, 2026
- Retake policy: After a failed attempt, candidates must wait five calendar days, starting the day after the attempt, before retesting
Passing awards the Cisco Certified Specialist - Collaboration Core credential and satisfies the core exam requirement for CCNP Collaboration (a concentration exam is still required for the full CCNP), while also qualifying candidates to sit the CCIE Collaboration lab exam. Certification and written-exam credit remain valid for three years, and renewal can be completed through eligible exams or Continuing Education credits - 40 credits for Specialist-level renewal, 80 for CCNP. Note that CE-only renewal does not extend the window for combining exam passes toward higher certifications.
For the full cost picture including retake fees and renewal paths, see CLCOR Certification Cost 2026: Complete Pricing Breakdown, and for exact scheduling windows check CLCOR Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Who Actually Hires for These Skills
The domain content maps directly onto real job functions: collaboration engineers configuring CUCM dial plans, network administrators managing Webex Calling rollouts, and voice engineers maintaining CUBE gateways for PSTN connectivity. Organizations running hybrid Cisco collaboration environments - on-premises call control alongside Webex cloud services - are the most common hiring context for this skill set.
If you want to see how these domain-level skills translate into job titles and responsibilities, CLCOR Jobs covers the roles that typically list this certification, and CLCOR Salary Guide 2026: Complete Earnings Analysis looks at how the credential factors into compensation conversations.
You can also start testing your domain knowledge right away using timed practice questions on the main practice test platform, which mirrors the multiple-choice and drag-and-drop style used on the real exam.
Frequently Asked Questions
Start with On-Premises Call Control, since it carries 30% of the exam - the largest single weight of the six domains - followed by Cloud and Hybrid Services at 25%.
Six: Infrastructure and Design, Protocols and Endpoints, On-Premises Call Control, Voice Gateways and Session Border Controllers, Cloud and Hybrid Services, and Media and QoS.
Yes, blueprint v2.0 takes effect on February 3, 2026, so candidates studying around that date should confirm which version their materials align with.
The exam includes multiple-choice and drag-and-drop items, plus possible performance-based lab items, in addition to standard question formats.
You must wait five calendar days, starting the day after your attempt, before you're eligible to retest.