Specifications

2. The 3CX Phone System will prompt you to conduct a firewall test
(http://www.3cx.com/blog/docs/firewallchecker/). Click “Run Firewall Checker”, and after
successfullycompletingthetest,returntothe“AddBridge”page.
3. Enteranameforthebridgeandassignavirtualextensionnumber.Thiswillbethenumberit
willbeaddressedby.Acceptthedefaultorchooseanotherextension thatisfree.Thevirtual
extensionnumberwillalsobeusedastheAuthenticationID,sothevirtualextensionchosen
shouldbeavailableandtheSAMEonBOTH3CXPhoneSystems.
4.

NowselecttheTypeofbridge:
● Master(DirectUDP)InDirectUDPmode,alltrafficwillbesentviaUDPandwill
usemultipleports.
● Master(TunnelTCP)ThetunneloptionallowsallSIPandRTPtraffictobesent
via a single TCP port. The 3CX Tunnel vastly simplifies firewall configuration,
althoughitcannotprovidethesamequalityasadirectconnection.Also,thetunnel
optioncanonlybeusedwithanother3CXPhoneSystem.
5. If you selected “Master (DirectUDP)”, enter the authentication password, which together
withtheVirtualextensionnumbermustbeusedbytheslavetoregister withthis3CXPhone
System. The Virtual extension number must be UNIQUE on this phone system and these
samecredentialsmustbeusedbythe“Slave”3CXPhoneSystem.
6. Ifyouselected“Master(TunnelTCP)”thenyoumustenter:
● AuthenticationPassword–Thepasswordthatwillbeusedforauthentication.
● Remote end of the tunnel – Enter the public IP of the Slave 3CX Phone System
machine.
● Entertheremoteportofthe3CXTunnel(bydefault5090).
● EntertheportoftheLOCALendofTunnel.Forthefirstbridgeconnectionitis5081
(5080 is used for external extensions). The port will be incremented by 1 for each
bridgeyoucreatethatusesthetunnel.YouwillhavetoforwardTCPandUDPport
5090onthefirewallbehindwhichthe“Master”3CXPhoneSystemresides.
7. Specifyaprefixtobeusedforthisbridge.I.e.ifyouspecify5,thenausermustdial5100to
reachextension100ontheother3CXPhoneSystem.
8. Select if you want to publishand receive presence information from the other 3CXPhone
System. Publish Information is available in Standard and Pro. Receive information is
availableonlyinProeditionlicense.
9. Select the users that are able to see this remote connection from within 3CXPhone for
Windows.
10. Acceptallotherdefaultsandclick“Next”tocreatethebridge.
Step2:CreateaBridgeontheSlavePhoneSystem