3CX ACADEMY ADVANCED CERTIFICATION
QUESTIONS WITH COMPLETE 100%
VERIFIED SOLUTIONS 2024/2025, EXAMS
OF COMPUTER SCIENCE
On outbound calls to external numbers, 3CX will process
"Outbound Rules" in a "Best Matching" way, depending on how
many of the criteria match. Correct Answer False
Wireshark can - without any additional Plugins Decode all Codecs
including G711A, G711U, GSM, G729, G726 Correct Answer
False
STUN extensions can be configured to connect to the tunnel port
of 3CX instead of the SIP port for more security. Correct Answer
False
The log files of 3CX are never cleaned even when you restart the
3CX Services Correct 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. Correct Answer
False
Remote extensions may be provisioned using the HTTP or
HTTPS URLs Correct Answer False
The default Voicemail PIN of an extension consist of 4 random
alphanumerical characters. Correct 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. Correct 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. Correct 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 Correct 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. Correct Answer True
When selecting the option "I need a 3CX FQDN" an internal DNS
is not mandatory Correct Answer True
The order of "Inbound Rules" is not important when you have DID
and CID "Inbound Rules", CIDs always have higher priority.
Correct 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. Correct 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? Correct
Answer True
In the criteria of the "Outbound Rules", "Calls from Extension(s)"
having comma separated values will allow multiple extension
ranges to be defined Correct Answer True
The Virtual Extension of the slave must match the master side
virtual extension number Correct 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. Correct Answer False
An extension will be allowed up to 25 attempts (default) for
authenticating successfully, after what it will be blacklisted for the
default blacklisting interval of 1800 minutes. Correct Answer
False
The 3CX SIP port should be filtered by firewall ACL rules to
maximize security and allow only trusted IPs to reach it (VoIP
providers or STUN extensions if any). Correct Answer True
SRTP will secure calls so that a middle-man can't see the SIP
traffic in plain-text. Correct Answer False
CID and DID "Inbound Rules" can both be configured to route
calls differently depending on the Office Hours. Correct Answer
True
"Prepend" will add digits to the end of the dialed number before
sending hte call to the destination defined in the "Route" Correct
Answer False
QUESTIONS WITH COMPLETE 100%
VERIFIED SOLUTIONS 2024/2025, EXAMS
OF COMPUTER SCIENCE
On outbound calls to external numbers, 3CX will process
"Outbound Rules" in a "Best Matching" way, depending on how
many of the criteria match. Correct Answer False
Wireshark can - without any additional Plugins Decode all Codecs
including G711A, G711U, GSM, G729, G726 Correct Answer
False
STUN extensions can be configured to connect to the tunnel port
of 3CX instead of the SIP port for more security. Correct Answer
False
The log files of 3CX are never cleaned even when you restart the
3CX Services Correct 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. Correct Answer
False
Remote extensions may be provisioned using the HTTP or
HTTPS URLs Correct Answer False
The default Voicemail PIN of an extension consist of 4 random
alphanumerical characters. Correct 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. Correct 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. Correct 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 Correct 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. Correct Answer True
When selecting the option "I need a 3CX FQDN" an internal DNS
is not mandatory Correct Answer True
The order of "Inbound Rules" is not important when you have DID
and CID "Inbound Rules", CIDs always have higher priority.
Correct 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. Correct 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? Correct
Answer True
In the criteria of the "Outbound Rules", "Calls from Extension(s)"
having comma separated values will allow multiple extension
ranges to be defined Correct Answer True
The Virtual Extension of the slave must match the master side
virtual extension number Correct 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. Correct Answer False
An extension will be allowed up to 25 attempts (default) for
authenticating successfully, after what it will be blacklisted for the
default blacklisting interval of 1800 minutes. Correct Answer
False
The 3CX SIP port should be filtered by firewall ACL rules to
maximize security and allow only trusted IPs to reach it (VoIP
providers or STUN extensions if any). Correct Answer True
SRTP will secure calls so that a middle-man can't see the SIP
traffic in plain-text. Correct Answer False
CID and DID "Inbound Rules" can both be configured to route
calls differently depending on the Office Hours. Correct Answer
True
"Prepend" will add digits to the end of the dialed number before
sending hte call to the destination defined in the "Route" Correct
Answer False
