3CX Academy, Advanced Certification
Questions
and Answers 100% Correct
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma separated
values will allow multiple extension ranges to be defined ✔✔True
The Virtual Extension of the slave must match the master side virtual extension number ✔✔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. ✔✔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. ✔✔False
Wireshark can - without any additional Plugins Decode all Codecs including G711A, G711U,
GSM, G729, G726 ✔✔False
STUN extensions can be configured to connect to the tunnel port of 3CX instead of the SIP port
for more security. ✔✔False
The log files of 3CX are never cleaned even when you restart the 3CX Services ✔✔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. ✔✔False
Remote extensions may be provisioned using the HTTP or HTTPS URLs ✔✔False
, The default Voicemail PIN of an extension consist of 4 random alphanumerical characters.
✔✔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. ✔✔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. ✔✔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 ✔✔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.
✔✔True
When selecting the option "I need a 3CX FQDN" an internal DNS is not mandatory ✔✔True
The order of "Inbound Rules" is not important when you have DID and CID "Inbound Rules",
CIDs always have higher priority. ✔✔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. ✔✔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? ✔✔True
Questions
and Answers 100% Correct
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma separated
values will allow multiple extension ranges to be defined ✔✔True
The Virtual Extension of the slave must match the master side virtual extension number ✔✔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. ✔✔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. ✔✔False
Wireshark can - without any additional Plugins Decode all Codecs including G711A, G711U,
GSM, G729, G726 ✔✔False
STUN extensions can be configured to connect to the tunnel port of 3CX instead of the SIP port
for more security. ✔✔False
The log files of 3CX are never cleaned even when you restart the 3CX Services ✔✔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. ✔✔False
Remote extensions may be provisioned using the HTTP or HTTPS URLs ✔✔False
, The default Voicemail PIN of an extension consist of 4 random alphanumerical characters.
✔✔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. ✔✔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. ✔✔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 ✔✔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.
✔✔True
When selecting the option "I need a 3CX FQDN" an internal DNS is not mandatory ✔✔True
The order of "Inbound Rules" is not important when you have DID and CID "Inbound Rules",
CIDs always have higher priority. ✔✔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. ✔✔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? ✔✔True
