3CX Academy, Advanced Certification Exam With
100% Correct Answers 2023, Exams of
Engineering
1. In the criteria of the "Outbound Rules", "Calls from Extension(s)" having
comma separated values will allow multiple extension ranges to be defined
ANS: True
2. The Virtual Extension of the slave must match the master side virtual exten-
sion number ANS: True
3. 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.
ANS: False
4. On outbound calls to external numbers, 3CX will process "Outbound Rules"
in a "Best Matching" way, depending on how many of the criteria match.
ANS: False
5. Wireshark can - without any additional Plugins Decode all Codecs including
G711A, G711U, GSM, G729, G726
ANS: False
6. STUN extensions can be configured to connect to the tunnel port of 3CX
instead of the SIP port for more security.
, ANS: False
7. The log files of 3CX are never cleaned even when you restart the 3CX Services-
ANS: False
8. 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. ANS: False
9. Remote extensions may be provisioned using the HTTP or HTTPS URLs
ANS: False
10. The default Voicemail PIN of an extension consist of 4 random alphanumer-
ical characters. ANS: False
11. 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.
ANS: True
12. 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. ANS: True
13. Your Local IP Phone loses the registration to 3CX and you want do trou-
bleshoot 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: ANS True
100% Correct Answers 2023, Exams of
Engineering
1. In the criteria of the "Outbound Rules", "Calls from Extension(s)" having
comma separated values will allow multiple extension ranges to be defined
ANS: True
2. The Virtual Extension of the slave must match the master side virtual exten-
sion number ANS: True
3. 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.
ANS: False
4. On outbound calls to external numbers, 3CX will process "Outbound Rules"
in a "Best Matching" way, depending on how many of the criteria match.
ANS: False
5. Wireshark can - without any additional Plugins Decode all Codecs including
G711A, G711U, GSM, G729, G726
ANS: False
6. STUN extensions can be configured to connect to the tunnel port of 3CX
instead of the SIP port for more security.
, ANS: False
7. The log files of 3CX are never cleaned even when you restart the 3CX Services-
ANS: False
8. 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. ANS: False
9. Remote extensions may be provisioned using the HTTP or HTTPS URLs
ANS: False
10. The default Voicemail PIN of an extension consist of 4 random alphanumer-
ical characters. ANS: False
11. 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.
ANS: True
12. 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. ANS: True
13. Your Local IP Phone loses the registration to 3CX and you want do trou-
bleshoot 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: ANS True
