3CX ACADEMY ADVANCED CERTIFICATION
QUESTIONS WITH COMPLETE 100%
VERIFIED SOLUTIONS 2026
1. True or False: The "Prepend" option in 3CX Outbound Rules
adds digits to the beginning of the dialed number before routing
the call.
Correct Answer True
2. True or False: In troubleshooting incoming call routing issues in
3CX, the first step is always to restart all services before capturing
logs.
Correct Answer False (Restarting may lose valuable diagnostic
information; generate support files and logs first.)
3. True or False: Once Secure SIP is enabled in 3CX, certificates
must be manually deployed to phones and softphones for secure
communication.
Correct Answer True
4. True or False: 3CX processes Outbound Rules using a "best
matching" approach, prioritizing rules with the most criteria
matches.
Correct Answer True
, 5. True or False: Full Cone NAT is recommended for 3CX
because it allows inbound traffic from any IP address once an
outbound connection is established.
Correct Answer True
6. True or False: SIP ALG should be enabled on routers for
optimal 3CX performance, as it helps rewrite SIP packets.
Correct Answer False (SIP ALG should be disabled to prevent
issues like one-way audio.)
7. True or False: Port Preservation in NAT settings ensures that
the source port remains the same for outbound and inbound
traffic in 3CX.
Correct Answer True
8. True or False: When installing 3CX without a 3CX-provided
FQDN in split DNS mode, local DNS resolution is required for
internal devices.
Correct Answer True
9. True or False: The 3CX Firewall Checker tool tests only
outbound connections and ignores inbound port forwarding.
Correct Answer False (It tests both inbound and outbound
connectivity.)
QUESTIONS WITH COMPLETE 100%
VERIFIED SOLUTIONS 2026
1. True or False: The "Prepend" option in 3CX Outbound Rules
adds digits to the beginning of the dialed number before routing
the call.
Correct Answer True
2. True or False: In troubleshooting incoming call routing issues in
3CX, the first step is always to restart all services before capturing
logs.
Correct Answer False (Restarting may lose valuable diagnostic
information; generate support files and logs first.)
3. True or False: Once Secure SIP is enabled in 3CX, certificates
must be manually deployed to phones and softphones for secure
communication.
Correct Answer True
4. True or False: 3CX processes Outbound Rules using a "best
matching" approach, prioritizing rules with the most criteria
matches.
Correct Answer True
, 5. True or False: Full Cone NAT is recommended for 3CX
because it allows inbound traffic from any IP address once an
outbound connection is established.
Correct Answer True
6. True or False: SIP ALG should be enabled on routers for
optimal 3CX performance, as it helps rewrite SIP packets.
Correct Answer False (SIP ALG should be disabled to prevent
issues like one-way audio.)
7. True or False: Port Preservation in NAT settings ensures that
the source port remains the same for outbound and inbound
traffic in 3CX.
Correct Answer True
8. True or False: When installing 3CX without a 3CX-provided
FQDN in split DNS mode, local DNS resolution is required for
internal devices.
Correct Answer True
9. True or False: The 3CX Firewall Checker tool tests only
outbound connections and ignores inbound port forwarding.
Correct Answer False (It tests both inbound and outbound
connectivity.)
