3CX BASIC
CERTIFICATION
PBX Administration & VoIP
2026/2027 Edition
SIP Trunking & System Configuration
100 Verified Questions with Detailed Rationales
EXAM SPECIFICATIONS
Time Allocation: 90 Minutes
Total Questions: 100 Questions
Question Format: Multiple Choice with Rationales
Minimum Competency: 85% Required to Pass
Core Focus: 3CX v20, VoIP, SIP, Extensions, Call Flow
3CX Basic Certification Exam Prep 2026/2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
This 3CX Basic Certification Exam Prep validates fundamental knowledge of 3CX Phone System v20
administration. Content covers PBX installation, SIP trunking, extension management, call routing,
and system configuration required for 3CX Basic Certification.
CONTENT DISTRIBUTION
• 3CX Installation & Setup (25%) — System requirements, deployment options, FQDN, SSL,
backup/restore
• SIP Trunks & VoIP Fundamentals (25%) — SIP protocol, codecs, NAT, firewall, provider setup,
DIDs
• Extensions & Endpoints (20%) — Extension creation, provisioning, IP phones, softphones, Web
Client
• Call Flow & Routing (20%) — Inbound rules, IVR, ring groups, queues, office hours, call
forwarding
• Security & Troubleshooting (10%) — Anti-hacking, IP blacklist, logs, firewall checker, call quality
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes a detailed rationale. Achieve 85% competency to pass certification.
STUDY STRATEGY
Install 3CX in a lab environment. Practice extension provisioning and SIP trunk setup. Understand
NAT/firewall concepts. Use rationales to master v20 admin console navigation.
CURRICULUM ALIGNMENT
Questions reflect 3CX Basic Certification v20 syllabus: PBX fundamentals, networking, security, and
core features. Updated for 2026/2027 platform changes.
3CX Basic Certification Exam Prep 2026/2027 Page 2
, SECTION I: 3CX Installation & System Setup
1. What is the minimum RAM requirement for 3CX v20 on-premise with up to 32 SC?
A. 1 GB
✓ B. 2 GB
C. 4 GB
D. 8 GB
Rationale: 3CX v20 requires minimum 2GB RAM for up to 32 simultaneous calls. 4GB recommended for 64
SC, 8GB for 128 SC. 1GB is insufficient for production.
2. 3CX requires which ports to be open on the firewall for external access?
A. 80, 443 only
✓ B. 5001 (HTTPS), 5060 (SIP), 5090 (Tunnel), 9000-9500 (RTP)
C. 21, 22, 23
D. 5060 only
Rationale: 3CX needs 5001 for Management Console, 5060 for SIP, 5090 for 3CX Tunnel, and 9000-9500
range for RTP audio. Port 80 redirects to 443. FTP/SSH ports not required.
3. An FQDN in 3CX is used for:
A. Internal extension dialing
✓ B. External access and SSL certificate validation
C. Voicemail storage
D. Call recording location
Rationale: Fully Qualified Domain Name enables external access to Management Console, Web Client, and
mobile apps. It's required for Let's Encrypt SSL certificates. Not used for internal dialing.
4. Which deployment method does NOT require port forwarding?
A. On-premise with static IP
✓ B. 3CX Hosted by 3CX
C. Self-hosted cloud
D. On-premise with dynamic IP
Rationale: 3CX Hosted eliminates port forwarding as 3CX manages infrastructure. On-premise and
self-hosted cloud require firewall/NAT configuration.
5. 3CX backups include which components by default?
A. Call recordings only
✓ B. System config, extensions, IVR, prompts, and optionally recordings
C. Operating system files
D. License key only
Rationale: 3CX backups contain PBX configuration, extensions, digital receptionists, and optionally
recordings/CDR. OS files and license are separate. Recordings-only is an option, not default.
3CX Basic Certification Exam Prep 2026/2027 Page 3
CERTIFICATION
PBX Administration & VoIP
2026/2027 Edition
SIP Trunking & System Configuration
100 Verified Questions with Detailed Rationales
EXAM SPECIFICATIONS
Time Allocation: 90 Minutes
Total Questions: 100 Questions
Question Format: Multiple Choice with Rationales
Minimum Competency: 85% Required to Pass
Core Focus: 3CX v20, VoIP, SIP, Extensions, Call Flow
3CX Basic Certification Exam Prep 2026/2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
This 3CX Basic Certification Exam Prep validates fundamental knowledge of 3CX Phone System v20
administration. Content covers PBX installation, SIP trunking, extension management, call routing,
and system configuration required for 3CX Basic Certification.
CONTENT DISTRIBUTION
• 3CX Installation & Setup (25%) — System requirements, deployment options, FQDN, SSL,
backup/restore
• SIP Trunks & VoIP Fundamentals (25%) — SIP protocol, codecs, NAT, firewall, provider setup,
DIDs
• Extensions & Endpoints (20%) — Extension creation, provisioning, IP phones, softphones, Web
Client
• Call Flow & Routing (20%) — Inbound rules, IVR, ring groups, queues, office hours, call
forwarding
• Security & Troubleshooting (10%) — Anti-hacking, IP blacklist, logs, firewall checker, call quality
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes a detailed rationale. Achieve 85% competency to pass certification.
STUDY STRATEGY
Install 3CX in a lab environment. Practice extension provisioning and SIP trunk setup. Understand
NAT/firewall concepts. Use rationales to master v20 admin console navigation.
CURRICULUM ALIGNMENT
Questions reflect 3CX Basic Certification v20 syllabus: PBX fundamentals, networking, security, and
core features. Updated for 2026/2027 platform changes.
3CX Basic Certification Exam Prep 2026/2027 Page 2
, SECTION I: 3CX Installation & System Setup
1. What is the minimum RAM requirement for 3CX v20 on-premise with up to 32 SC?
A. 1 GB
✓ B. 2 GB
C. 4 GB
D. 8 GB
Rationale: 3CX v20 requires minimum 2GB RAM for up to 32 simultaneous calls. 4GB recommended for 64
SC, 8GB for 128 SC. 1GB is insufficient for production.
2. 3CX requires which ports to be open on the firewall for external access?
A. 80, 443 only
✓ B. 5001 (HTTPS), 5060 (SIP), 5090 (Tunnel), 9000-9500 (RTP)
C. 21, 22, 23
D. 5060 only
Rationale: 3CX needs 5001 for Management Console, 5060 for SIP, 5090 for 3CX Tunnel, and 9000-9500
range for RTP audio. Port 80 redirects to 443. FTP/SSH ports not required.
3. An FQDN in 3CX is used for:
A. Internal extension dialing
✓ B. External access and SSL certificate validation
C. Voicemail storage
D. Call recording location
Rationale: Fully Qualified Domain Name enables external access to Management Console, Web Client, and
mobile apps. It's required for Let's Encrypt SSL certificates. Not used for internal dialing.
4. Which deployment method does NOT require port forwarding?
A. On-premise with static IP
✓ B. 3CX Hosted by 3CX
C. Self-hosted cloud
D. On-premise with dynamic IP
Rationale: 3CX Hosted eliminates port forwarding as 3CX manages infrastructure. On-premise and
self-hosted cloud require firewall/NAT configuration.
5. 3CX backups include which components by default?
A. Call recordings only
✓ B. System config, extensions, IVR, prompts, and optionally recordings
C. Operating system files
D. License key only
Rationale: 3CX backups contain PBX configuration, extensions, digital receptionists, and optionally
recordings/CDR. OS files and license are separate. Recordings-only is an option, not default.
3CX Basic Certification Exam Prep 2026/2027 Page 3
