3CX BASIC CERTIFICATION SCRIPT 2026
TESTED QUESTIONS AND FULL SOLUTION
◉ 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
TESTED QUESTIONS AND FULL SOLUTION
◉ 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
