Hello,
Prompt, the license for a fax is anchored to an amount of net boards?
This hasn’t translated well, but I think he is asking whether the Digium fax software is keyed to the MAC address of the network board.
Per point two of the General Notes section of the README, yes. If you change the available ethernet interfaces, the calculated hash changes, which may not jive with what you registered the license against.
downloads.digium.com/pub/telephony/fax/README
Cheers.