OptiPlex 5090 Micro Form Factor Setup and Specifications
SOLVED: If you want to connect to 3CX remotely using the 3CX Apps, you only need to port forward/NAT port 5090 (TCP/UDP) on the firewall in front of the 3CX PBX.
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Change SIP port
Solved: 3CX Phone System behind 1450 Appliance - Check Point CheckMates
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