How to use fax if using multiple network interfaces
If your machine has multiple network interfaces, you must specify which IP the fax service must bind to. To do this:
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Open the 3CX PhoneSystem.ini file, located in the 3CX Program Files directory.
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Create this entry:
[Fax]
serverHost = 10.172.0.2
where the IP must match the IP to which the fax service must bind.
This IP must be on the same subnet as the VOIP gateway!
General 3CX Phone System FAQs 
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