Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
3CX Academy, Advanced Certification
Exam Study Guide Solutions
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma separated values will
allow multiple extension ranges to be defined - ANSWER✔✔-True
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
Copyright ©Stuvia International BV 2010-2024 Page 1/7
, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
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
Copyright ©Stuvia International BV 2010-2024 Page 2/7
3CX Academy, Advanced Certification
Exam Study Guide Solutions
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma separated values will
allow multiple extension ranges to be defined - ANSWER✔✔-True
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
Copyright ©Stuvia International BV 2010-2024 Page 1/7
, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
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
Copyright ©Stuvia International BV 2010-2024 Page 2/7
