3CX ACADEMY ADVANCED
CERTIFICATION EXAM ACTUAL EXAM
COMPLETE 150 QUESTIONS WITH
DETAILED VERIFIED ANSWERS
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma
separated values will allow multiple extension ranges to be defined - ANSWERTrue
The Virtual Extension of the slave must match the master side virtual extension number
- ANSWERTrue
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. - ANSWERFalse
On outbound calls to external numbers, 3CX will process "Outbound Rules" in a "Best
Matching" way, depending on how many of the criteria match. - ANSWERFalse
Wireshark can - without any additional Plugins Decode all Codecs including G711A,
G711U, GSM, G729, G726 - ANSWERFalse
STUN extensions can be configured to connect to the tunnel port of 3CX instead of the
SIP port for more security. - ANSWERFalse
The log files of 3CX are never cleaned even when you restart the 3CX Services -
ANSWERFalse
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. -
ANSWERFalse
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. - ANSWERTrue
When selecting the option "I need a 3CX FQDN" an internal DNS is not mandatory -
ANSWERTrue
The order of "Inbound Rules" is not important when you have DID and CID "Inbound
Rules", CIDs always have higher priority. - ANSWERFalse
, 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. - ANSWERFalse
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? - ANSWERTrue
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. -
ANSWERFalse
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). - ANSWERTrue
SRTP will secure calls so that a middle-man can't see the SIP traffic in plain-text. -
ANSWERFalse
CID and DID "Inbound Rules" can both be configured to route calls differently
depending on the Office Hours. - ANSWERTrue
"Prepend" will add digits to the end of the dialed number before sending hte call to the
destination defined in the "Route" - ANSWERFalse
Your Local IP Phone loses the Registration to 3CX and you want to troubleshoot the
issue. You should start a Wireshark Capture on the 3CX Server, reboot the phone, and
then apply the Filter sip.Cseq.Method==SUBSCRIBE in order to see if registrations are
reaching 3CX. - ANSWERFalse
The "Server Activity Log" will provide information for: Phone Registrations, Gateway and
SIP Trunk Interactions, All Related Calls - ANSWERTrue
Each extension gets a default password which is always the same and should be
changed for more safety. - ANSWERFalse
You are debugging an audio issue using wireshark by analysing the RTP streams.
While using the RTP Stream analysis tools you see that the MAX Delta of packages
from the Provider to 3CX is 8-- MS while the Max Delta for the reverse direction is 20
Ms. The issue is located at the provider end and not 3CX end. - ANSWERTrue
If you want to check 3CX routing of a call then only a Wireshark capture is needed, -
ANSWERFalse
Remote extensions may be provisioned using the HTTP or HTTPS URLs -
ANSWERFalse
CERTIFICATION EXAM ACTUAL EXAM
COMPLETE 150 QUESTIONS WITH
DETAILED VERIFIED ANSWERS
In the criteria of the "Outbound Rules", "Calls from Extension(s)" having comma
separated values will allow multiple extension ranges to be defined - ANSWERTrue
The Virtual Extension of the slave must match the master side virtual extension number
- ANSWERTrue
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. - ANSWERFalse
On outbound calls to external numbers, 3CX will process "Outbound Rules" in a "Best
Matching" way, depending on how many of the criteria match. - ANSWERFalse
Wireshark can - without any additional Plugins Decode all Codecs including G711A,
G711U, GSM, G729, G726 - ANSWERFalse
STUN extensions can be configured to connect to the tunnel port of 3CX instead of the
SIP port for more security. - ANSWERFalse
The log files of 3CX are never cleaned even when you restart the 3CX Services -
ANSWERFalse
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. -
ANSWERFalse
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. - ANSWERTrue
When selecting the option "I need a 3CX FQDN" an internal DNS is not mandatory -
ANSWERTrue
The order of "Inbound Rules" is not important when you have DID and CID "Inbound
Rules", CIDs always have higher priority. - ANSWERFalse
, 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. - ANSWERFalse
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? - ANSWERTrue
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. -
ANSWERFalse
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). - ANSWERTrue
SRTP will secure calls so that a middle-man can't see the SIP traffic in plain-text. -
ANSWERFalse
CID and DID "Inbound Rules" can both be configured to route calls differently
depending on the Office Hours. - ANSWERTrue
"Prepend" will add digits to the end of the dialed number before sending hte call to the
destination defined in the "Route" - ANSWERFalse
Your Local IP Phone loses the Registration to 3CX and you want to troubleshoot the
issue. You should start a Wireshark Capture on the 3CX Server, reboot the phone, and
then apply the Filter sip.Cseq.Method==SUBSCRIBE in order to see if registrations are
reaching 3CX. - ANSWERFalse
The "Server Activity Log" will provide information for: Phone Registrations, Gateway and
SIP Trunk Interactions, All Related Calls - ANSWERTrue
Each extension gets a default password which is always the same and should be
changed for more safety. - ANSWERFalse
You are debugging an audio issue using wireshark by analysing the RTP streams.
While using the RTP Stream analysis tools you see that the MAX Delta of packages
from the Provider to 3CX is 8-- MS while the Max Delta for the reverse direction is 20
Ms. The issue is located at the provider end and not 3CX end. - ANSWERTrue
If you want to check 3CX routing of a call then only a Wireshark capture is needed, -
ANSWERFalse
Remote extensions may be provisioned using the HTTP or HTTPS URLs -
ANSWERFalse
