3CX Academy, Advanced Certification Exam
Questions And 100% Correct Answers
Within the "Outbound Rules" criteria, the "Calls from Extension(s)" having
comma-separated values will allow defining multiple ranges of extensions. Answer: True
The virtual extension of a slave must match the master side virtual extension number.
Answer: True
For extensions registered over more than one site-to-site VPNs - by default, 3CX delivers
the audio between phones if they are on different subnets. Answer: False
Depending on how many of the criteria match, 3CX will process "Outbound Rules" in a
"Best Matching" way on outbound calls to external numbers. - 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
3CX log files are never cleaned even upon restart of the 3CX Services- Answer: False
Once Secure SIP has been configured in 3CX, Secure SIP certificates will have to be
manually deployed 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 Voicemail PIN of an extension, by default, consists of 4 random alphanumerical
characters. - Answer False
Your 3CX has only one SIP Trunk and it 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 receiving extension will see "5791691" in its display as
caller ID. - 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
The Local IP Phone loses the registration to 3CX and you want to troubleshoot the issue.
You want to start a Wireshark Capture on the 3CX Server, reboot the phone, then apply
the Filter sip.Cseq.Method==REGISTER to see if the registrations are reaching 3CX.
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" does NOT matter, when you have DID and CID "Inbound
Rules", CIDs are always 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, it is
necessary to use a prefix. - 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
Questions And 100% Correct Answers
Within the "Outbound Rules" criteria, the "Calls from Extension(s)" having
comma-separated values will allow defining multiple ranges of extensions. Answer: True
The virtual extension of a slave must match the master side virtual extension number.
Answer: True
For extensions registered over more than one site-to-site VPNs - by default, 3CX delivers
the audio between phones if they are on different subnets. Answer: False
Depending on how many of the criteria match, 3CX will process "Outbound Rules" in a
"Best Matching" way on outbound calls to external numbers. - 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
3CX log files are never cleaned even upon restart of the 3CX Services- Answer: False
Once Secure SIP has been configured in 3CX, Secure SIP certificates will have to be
manually deployed 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 Voicemail PIN of an extension, by default, consists of 4 random alphanumerical
characters. - Answer False
Your 3CX has only one SIP Trunk and it 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 receiving extension will see "5791691" in its display as
caller ID. - 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
The Local IP Phone loses the registration to 3CX and you want to troubleshoot the issue.
You want to start a Wireshark Capture on the 3CX Server, reboot the phone, then apply
the Filter sip.Cseq.Method==REGISTER to see if the registrations are reaching 3CX.
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" does NOT matter, when you have DID and CID "Inbound
Rules", CIDs are always 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, it is
necessary to use a prefix. - 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
