3CX ACADEMY BASIC INTERMEDIATE ADVANCED CERTIFICATION BUNDLED TEST 2026 QUESTIONS AND VERIFIED ANSWERS GRADED A+

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)..