3CX ACADEMY ADVANCED CERTIFICATION
UPDATED EXAMS TEST PAPER QUESTIONS AND
ANSWERS SURE A+
✔✔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
✔✔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. - ✔✔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). - ✔✔True
✔✔SRTP will secure calls so that a middle-man can't see the SIP traffic in plain-text. -
✔✔False
✔✔CID and DID "Inbound Rules" can both be configured to route calls differently
depending on the Office Hours. - ✔✔True
✔✔"Prepend" will add digits to the end of the dialed number before sending hte call to
the destination defined in the "Route" - ✔✔False
✔✔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. - ✔✔False
✔✔The "Server Activity Log" will provide information for: Phone Registrations, Gateway
and SIP Trunk Interactions, All Related Calls - ✔✔True
✔✔Each extension gets a default password which is always the same and should be
changed for more safety. - ✔✔False
✔✔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. - ✔✔True
✔✔If you want to check 3CX routing of a call then only a Wireshark capture is needed, -
✔✔False
✔✔Knowing only the FQDN/port of 3CX and the MAC address of a phone I could guess
its provisioning URL. - ✔✔False
✔✔An outbound call is routed through the VoIP Provider. This "Route" of the "Outbound
Rule" has "Strip Digits" set as 0 and has no values in the "Prepend" field. A user dials
004433272020. 3CX will send the call to the provider exactly as dialed - ✔✔True
✔✔You can use the same VoIP Provider in all of the Outgoing Routes of a rule -
✔✔True
UPDATED EXAMS TEST PAPER QUESTIONS AND
ANSWERS SURE A+
✔✔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
✔✔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. - ✔✔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). - ✔✔True
✔✔SRTP will secure calls so that a middle-man can't see the SIP traffic in plain-text. -
✔✔False
✔✔CID and DID "Inbound Rules" can both be configured to route calls differently
depending on the Office Hours. - ✔✔True
✔✔"Prepend" will add digits to the end of the dialed number before sending hte call to
the destination defined in the "Route" - ✔✔False
✔✔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. - ✔✔False
✔✔The "Server Activity Log" will provide information for: Phone Registrations, Gateway
and SIP Trunk Interactions, All Related Calls - ✔✔True
✔✔Each extension gets a default password which is always the same and should be
changed for more safety. - ✔✔False
✔✔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. - ✔✔True
✔✔If you want to check 3CX routing of a call then only a Wireshark capture is needed, -
✔✔False
✔✔Knowing only the FQDN/port of 3CX and the MAC address of a phone I could guess
its provisioning URL. - ✔✔False
✔✔An outbound call is routed through the VoIP Provider. This "Route" of the "Outbound
Rule" has "Strip Digits" set as 0 and has no values in the "Prepend" field. A user dials
004433272020. 3CX will send the call to the provider exactly as dialed - ✔✔True
✔✔You can use the same VoIP Provider in all of the Outgoing Routes of a rule -
✔✔True
