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Firewall Configuration for 3CX

In order for  3CX to work with VoIP providers and directly connected external extensions it must be able to establish communication to the devices and VoIP provider. Additionally, the firewall must be prepared to operate correctly with SIP. A firewall without an integrated SIP server (such AVM Fritz box or Speedport) or SIP ALG is preferable.

Firewall & Router Configuration basics


Router Specific Firewall Configurations


Additional Info and FAQ’s


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