3CX ACADEMY ADVANCED CERTIFICATION 2026
TEST QUESTIONS AND ANSWERS SURE A+
✔✔If a site-to-site VPN is already in place between the PBX location and a remote
location, phones should be provisioned with Direct/STUN provisioning method. -
✔✔False
✔✔The default Voicemail PIN of an extension consist of 4 random alphanumerical
characters. - ✔✔False
✔✔In order to check which side (Caller or Calee) terminated the call first, you can check
using wireshark to see who sent the first BYE message. - ✔✔True
✔✔You are having an issue with incoming call routing being sent to the wrong internal
destination once it is received by 3CX. The first step to troubleshoot the issue would be
to set your System to Verbose Logging, start wireshark, replicate the issue and then
Restart all 3CX Services, generate the support files and send them to 3CX Support for
troubleshooting - ✔✔False
✔✔Setting a Name when creating a "CID Inbound Rule" is mandatory - ✔✔False
, ✔✔When the option "Remote PBX uses SBC/Tunnel Connection" is enabled on the
master bridge, the Slabe bridge must be registered behind the SBC. - ✔✔False
✔✔You can take a phone that has already been provisioned with RPS as remote STUN
Extension and configure it as a Local LAN extension, as long as 2 weeks have passed
since the phone was provisioned as a STUN extension - ✔✔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
✔✔Remote presence of a bridged system is available in both IP Phones (via BLF) and
the 3CX Phone for Windows - ✔✔False
✔✔The numbering plan of bridged systems must be different in order for outgoing calls
to the bridge to work - ✔✔False
✔✔ZRTP and SRTP are both supported to secure the audio stream of calls within the
3CX Phone System. - ✔✔False
✔✔The 3CX Instance Manager is available for 3CX v16+ installs on what Operating
System? - ✔✔Linux x86 with no failover or hosting mode enabled
✔✔The 3CX Instance Manager allows you to perform batch updates - ✔✔True
✔✔ 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
TEST QUESTIONS AND ANSWERS SURE A+
✔✔If a site-to-site VPN is already in place between the PBX location and a remote
location, phones should be provisioned with Direct/STUN provisioning method. -
✔✔False
✔✔The default Voicemail PIN of an extension consist of 4 random alphanumerical
characters. - ✔✔False
✔✔In order to check which side (Caller or Calee) terminated the call first, you can check
using wireshark to see who sent the first BYE message. - ✔✔True
✔✔You are having an issue with incoming call routing being sent to the wrong internal
destination once it is received by 3CX. The first step to troubleshoot the issue would be
to set your System to Verbose Logging, start wireshark, replicate the issue and then
Restart all 3CX Services, generate the support files and send them to 3CX Support for
troubleshooting - ✔✔False
✔✔Setting a Name when creating a "CID Inbound Rule" is mandatory - ✔✔False
, ✔✔When the option "Remote PBX uses SBC/Tunnel Connection" is enabled on the
master bridge, the Slabe bridge must be registered behind the SBC. - ✔✔False
✔✔You can take a phone that has already been provisioned with RPS as remote STUN
Extension and configure it as a Local LAN extension, as long as 2 weeks have passed
since the phone was provisioned as a STUN extension - ✔✔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
✔✔Remote presence of a bridged system is available in both IP Phones (via BLF) and
the 3CX Phone for Windows - ✔✔False
✔✔The numbering plan of bridged systems must be different in order for outgoing calls
to the bridge to work - ✔✔False
✔✔ZRTP and SRTP are both supported to secure the audio stream of calls within the
3CX Phone System. - ✔✔False
✔✔The 3CX Instance Manager is available for 3CX v16+ installs on what Operating
System? - ✔✔Linux x86 with no failover or hosting mode enabled
✔✔The 3CX Instance Manager allows you to perform batch updates - ✔✔True
✔✔ 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
