3CX ACADEMY BASIC INTERMEDIATE
ADVANCED CERTIFICATION BUNDLED
TEST 2026 QUESTIONS AND VERIFIED
ANSWERS GRADED A+
⩥ The Virtual Extension of the slave must match the master side virtual
extension number.
Answer: True
⩥ For extensions that are registered over multiple site-to-site VPNs, by
default 3CX delivers the audio between phones if they are on different
subnets..
Answer: False
⩥ On outbound calls to external numbers, 3CX will process "Outbound
Rules" in a "Best Matching" way, depending on how many of the criteria
match..
Answer: False
⩥ Wireshark can - without any additional Plugins Decode all Codecs
including G711A, G711U, GSM, G729, G726.
Answer: False
,⩥ STUN extensions can be configured to connect to the tunnel port of
3CX instead of the SIP port for more security..
Answer: False
⩥ The log files of 3CX are never cleaned even when you restart the 3CX
Services.
Answer: False
⩥ Once Secure SIP has been configured in 3CX, Secure SIP certificates
will need to be deployed manually in phones and softphones OS so that
they can communicate..
Answer: False
⩥ Remote extensions may be provisioned using the HTTP or HTTPS
URLs.
Answer: False
⩥ The default Voicemail PIN of an extension consist of 4 random
alphanumerical characters..
Answer: False
⩥ Your 3CX has only one SIP Trunk and receives a call from number
8135791691. If you have a "Inbound CID Reformatting" rule on the
Trunk with "Source Pattern" 813(...)(.*) and "Replace Pattern" \1\2, the
,extension that receives the call will see "5791691" as the caller ID on its
display..
Answer: True
⩥ When 3CX has been installed without a FQDN from 3CX and in split
DNS mode, the DNS server must not be installed on the same machine
as the phone system..
Answer: True
⩥ Your Local IP Phone loses the registration to 3CX and you want do
troubleshoot the issue. You should start a Wireshark Capture on the 3CX
Server, reboot the phone, and then apply the Filter
sip.Cseq.Method==REGISTER in order to see if registrations are
reaching 3CX.
Answer: True
⩥ Your 3CX has only one SIP Trunk and receives a call from number
422033272020 and you want it to be presented on the extension display
as +44272020. You can do this with a "Inbound CID Reformatting" rule
on the Trunk with "Source Pattern" 44(..)(..)(.*) and "Replace Pattern"
+44\3..
Answer: True
⩥ When selecting the option "I need a 3CX FQDN" an internal DNS is
not mandatory.
, Answer: True
⩥ The order of "Inbound Rules" is not important when you have DID
and CID "Inbound Rules", CIDs always have higher priority..
Answer: False
⩥ You have a Master Bridge with 3-digit extensions 1xxx and a Slave
Bridge with 4-digit extensions 2xxx. In the "Outbound Rules" you use to
rote calls across the bridge, using a prefix is mandatory..
Answer: False
⩥ You have run the 3CX "Firewall Checker" and comes up as Green, but
you still have audio issues and calls dropping on on outbound / inbound
calls. Can SIP ALG be the culprit?.
Answer: True
⩥ An extension will be allowed up to 25 attempts (default) for
authenticating successfully, after what it will be blacklisted for the
default blacklisting interval of 1800 minutes..
Answer: False
⩥ The 3CX SIP port should be filtered by firewall ACL rules to
maximize security and allow only trusted IPs to reach it (VoIP providers
or STUN extensions if any)..
ADVANCED CERTIFICATION BUNDLED
TEST 2026 QUESTIONS AND VERIFIED
ANSWERS GRADED A+
⩥ The Virtual Extension of the slave must match the master side virtual
extension number.
Answer: True
⩥ For extensions that are registered over multiple site-to-site VPNs, by
default 3CX delivers the audio between phones if they are on different
subnets..
Answer: False
⩥ On outbound calls to external numbers, 3CX will process "Outbound
Rules" in a "Best Matching" way, depending on how many of the criteria
match..
Answer: False
⩥ Wireshark can - without any additional Plugins Decode all Codecs
including G711A, G711U, GSM, G729, G726.
Answer: False
,⩥ STUN extensions can be configured to connect to the tunnel port of
3CX instead of the SIP port for more security..
Answer: False
⩥ The log files of 3CX are never cleaned even when you restart the 3CX
Services.
Answer: False
⩥ Once Secure SIP has been configured in 3CX, Secure SIP certificates
will need to be deployed manually in phones and softphones OS so that
they can communicate..
Answer: False
⩥ Remote extensions may be provisioned using the HTTP or HTTPS
URLs.
Answer: False
⩥ The default Voicemail PIN of an extension consist of 4 random
alphanumerical characters..
Answer: False
⩥ Your 3CX has only one SIP Trunk and receives a call from number
8135791691. If you have a "Inbound CID Reformatting" rule on the
Trunk with "Source Pattern" 813(...)(.*) and "Replace Pattern" \1\2, the
,extension that receives the call will see "5791691" as the caller ID on its
display..
Answer: True
⩥ When 3CX has been installed without a FQDN from 3CX and in split
DNS mode, the DNS server must not be installed on the same machine
as the phone system..
Answer: True
⩥ Your Local IP Phone loses the registration to 3CX and you want do
troubleshoot the issue. You should start a Wireshark Capture on the 3CX
Server, reboot the phone, and then apply the Filter
sip.Cseq.Method==REGISTER in order to see if registrations are
reaching 3CX.
Answer: True
⩥ Your 3CX has only one SIP Trunk and receives a call from number
422033272020 and you want it to be presented on the extension display
as +44272020. You can do this with a "Inbound CID Reformatting" rule
on the Trunk with "Source Pattern" 44(..)(..)(.*) and "Replace Pattern"
+44\3..
Answer: True
⩥ When selecting the option "I need a 3CX FQDN" an internal DNS is
not mandatory.
, Answer: True
⩥ The order of "Inbound Rules" is not important when you have DID
and CID "Inbound Rules", CIDs always have higher priority..
Answer: False
⩥ You have a Master Bridge with 3-digit extensions 1xxx and a Slave
Bridge with 4-digit extensions 2xxx. In the "Outbound Rules" you use to
rote calls across the bridge, using a prefix is mandatory..
Answer: False
⩥ You have run the 3CX "Firewall Checker" and comes up as Green, but
you still have audio issues and calls dropping on on outbound / inbound
calls. Can SIP ALG be the culprit?.
Answer: True
⩥ An extension will be allowed up to 25 attempts (default) for
authenticating successfully, after what it will be blacklisted for the
default blacklisting interval of 1800 minutes..
Answer: False
⩥ The 3CX SIP port should be filtered by firewall ACL rules to
maximize security and allow only trusted IPs to reach it (VoIP providers
or STUN extensions if any)..
