1
3CX Academy Advanced Certification Exam Test
2025 Actual Exam 2026/2027 | Complete Exam-
Style Questions | 100% Verified – Detailed
Rationales – Pass Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | 3CX Architecture and Deployment | Q1 – Q10
Section 2 | User Configuration and Extension Management | Q11 – Q20
Section 3 | SIP Trunking and Advanced Routing | Q21 – Q30
Section 4 | Security, Monitoring, and Troubleshooting | Q31 – Q40
Section 5 | System Backup, Updates, and Disaster Recovery | Q41 – Q50
══════════════════════════════════════
SECTION 1: 3CX ARCHITECTURE AND DEPLOYMENT Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A logistics company with a central 3CX server at HQ and a remote branch office needs reliable
telephony across a WAN link with limited bandwidth. The branch requires failover calling if the
WAN goes down. What is the most robust architectural deployment for the branch site?
A. Deploy softphones only at the branch connected via VPN to HQ
B. Install a local gateway with PSTN lines and configure the 3CX system for remote
survivability
C. Rely entirely on mobile apps with cellular data backup
D. Implement a cloud-hosted VoIP provider exclusively for branch users
Correct Answer: B
,2
Rationale: A local gateway with PSTN lines ensures the branch site remains operational for
external calls even if the WAN connection to HQ fails, which is critical for business continuity.
Softphones or cloud solutions rely entirely on internet connectivity, creating a single point of
failure during outages. This architecture provides the necessary redundancy for a remote branch.
Question 2 of 50
You are deploying a new 3CX instance in a virtualized environment using VMware. The server
handles 50 concurrent calls and uses the G.729 codec. How should you configure the CPU
resource allocation to ensure high voice quality?
A. Reserve 2 vCPUs and disable hyper-threading
B. Assign 4 vCPUs with a reservation of 80%
C. Pin 8 vCPUs to specific physical cores
D. Set CPU affinity to a single socket
Correct Answer: B
Rationale: Assigning 4 vCPUs with an 80% reservation provides sufficient processing power for
transcoding 50 concurrent calls while allowing the hypervisor to manage resources efficiently
during idle times. Pinning cores or disabling hyper-threading is an advanced optimization that
can actually reduce performance in virtual environments if not managed perfectly.
Question 3 of 50
A university campus is experiencing one-way audio issues on remote extensions connected via a
VPN tunnel. The signaling works perfectly, and the remote user can hear the office, but the office
cannot hear them. Where is the most likely location of the configuration error?
A. The SIP registrar settings on the remote phone
B. The firewall rules at the remote site allowing RTP ports
, 3
C. The DNS resolution for the SIP server FQDN
D. The bandwidth allocation policy on the main router
Correct Answer: B
Rationale: One-way audio where one party can hear the other is almost always caused by RTP
(Real-time Transport Protocol) packets being blocked by a firewall, typically because the ports
aren't opened in the correct direction for the return traffic. SIP signaling uses port 5060, but the
audio stream uses a dynamic range of UDP ports that must be forwarded.
Question 4 of 50
A legal firm is deploying 3CX and requires that all voicemails be encrypted at rest to comply
with client confidentiality requirements. Which storage configuration best meets this requirement
without relying solely on full disk encryption?
A. Store voicemails as WAV files on an unencrypted share
B. Configure 3CX to email voicemails to an externally hosted encrypted email service
C. Enable "Store on Disk" without password protection
D. Disable voicemail entirely to avoid liability
Correct Answer: B
Rationale: Offloading voicemails to an externally hosted encrypted email service ensures that the
files are encrypted at rest and in transit, meeting strict compliance standards for confidentiality.
Storing WAV files locally on an unencrypted share leaves them vulnerable to access if the server
is compromised, and disabling voicemail is not a viable business solution.
Question 5 of 50
3CX Academy Advanced Certification Exam Test
2025 Actual Exam 2026/2027 | Complete Exam-
Style Questions | 100% Verified – Detailed
Rationales – Pass Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | 3CX Architecture and Deployment | Q1 – Q10
Section 2 | User Configuration and Extension Management | Q11 – Q20
Section 3 | SIP Trunking and Advanced Routing | Q21 – Q30
Section 4 | Security, Monitoring, and Troubleshooting | Q31 – Q40
Section 5 | System Backup, Updates, and Disaster Recovery | Q41 – Q50
══════════════════════════════════════
SECTION 1: 3CX ARCHITECTURE AND DEPLOYMENT Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A logistics company with a central 3CX server at HQ and a remote branch office needs reliable
telephony across a WAN link with limited bandwidth. The branch requires failover calling if the
WAN goes down. What is the most robust architectural deployment for the branch site?
A. Deploy softphones only at the branch connected via VPN to HQ
B. Install a local gateway with PSTN lines and configure the 3CX system for remote
survivability
C. Rely entirely on mobile apps with cellular data backup
D. Implement a cloud-hosted VoIP provider exclusively for branch users
Correct Answer: B
,2
Rationale: A local gateway with PSTN lines ensures the branch site remains operational for
external calls even if the WAN connection to HQ fails, which is critical for business continuity.
Softphones or cloud solutions rely entirely on internet connectivity, creating a single point of
failure during outages. This architecture provides the necessary redundancy for a remote branch.
Question 2 of 50
You are deploying a new 3CX instance in a virtualized environment using VMware. The server
handles 50 concurrent calls and uses the G.729 codec. How should you configure the CPU
resource allocation to ensure high voice quality?
A. Reserve 2 vCPUs and disable hyper-threading
B. Assign 4 vCPUs with a reservation of 80%
C. Pin 8 vCPUs to specific physical cores
D. Set CPU affinity to a single socket
Correct Answer: B
Rationale: Assigning 4 vCPUs with an 80% reservation provides sufficient processing power for
transcoding 50 concurrent calls while allowing the hypervisor to manage resources efficiently
during idle times. Pinning cores or disabling hyper-threading is an advanced optimization that
can actually reduce performance in virtual environments if not managed perfectly.
Question 3 of 50
A university campus is experiencing one-way audio issues on remote extensions connected via a
VPN tunnel. The signaling works perfectly, and the remote user can hear the office, but the office
cannot hear them. Where is the most likely location of the configuration error?
A. The SIP registrar settings on the remote phone
B. The firewall rules at the remote site allowing RTP ports
, 3
C. The DNS resolution for the SIP server FQDN
D. The bandwidth allocation policy on the main router
Correct Answer: B
Rationale: One-way audio where one party can hear the other is almost always caused by RTP
(Real-time Transport Protocol) packets being blocked by a firewall, typically because the ports
aren't opened in the correct direction for the return traffic. SIP signaling uses port 5060, but the
audio stream uses a dynamic range of UDP ports that must be forwarded.
Question 4 of 50
A legal firm is deploying 3CX and requires that all voicemails be encrypted at rest to comply
with client confidentiality requirements. Which storage configuration best meets this requirement
without relying solely on full disk encryption?
A. Store voicemails as WAV files on an unencrypted share
B. Configure 3CX to email voicemails to an externally hosted encrypted email service
C. Enable "Store on Disk" without password protection
D. Disable voicemail entirely to avoid liability
Correct Answer: B
Rationale: Offloading voicemails to an externally hosted encrypted email service ensures that the
files are encrypted at rest and in transit, meeting strict compliance standards for confidentiality.
Storing WAV files locally on an unencrypted share leaves them vulnerable to access if the server
is compromised, and disabling voicemail is not a viable business solution.
Question 5 of 50
