1) Get a 4-port TDM card and install it into your Asterisk box. Connect the TDM ports to your modem ports. Then forward incoming calls on fax DIDs to those TDM ports.
Digium TDM 4 fxs is not really a good choice for a faxing system. I've tested it for a while. You should read old messages here about it.
Faxes coming in from PSTN DID's going directly to a TDM card is a very good and reliable solution. In this setup the fax call can be directly bridged from the PSTN to your fax machine with no codecs or lossy compression, etc. This is exactly the solution I've been using for two production fax setups, and they have worked under heavy usage without any issues since I put them in (about 3 months).
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