I have a customer who wants to use a Fax Server program called Net Satisfaxtion.

they have one inbound DID trunk and twenty numbers.

Can I assign analog port to a calling group and use it this way. I would probably setup the DID numbers as Adjuncts and cover them to the calling group.

My question is which setup do I use, auto login? And will it pass the DTMF string to ID the extension number. It needs to do this. I know it does on VM, but what about the others. Can I set it up as intergrated VM and have it work?

You would need to add a T-1 card in the Legend to connect to the Fax Server. The call comes in on the DID trunk, the "extension" that matches the DID number is set up as a Non-Local UDP extension. The call is sent out through the T-1 card, where it is "answered" by a "black-box" that reads the extension number, receives the Fax, and then matches the extension number to the mailbox it is intended for.

Go here:
https://www.faxback.com/products/enterprise/index.html
and click the link in the first paragraph where it says "offers DID inbound routing" to see a good popup that explains it all.

How do you setup the T1 link? Is the fax server considered a "network legend"?

This all depends on the Fax interface. T1, digital or analog. You can set up an ISDN custom protocol Tie trunk using network or pbx switch types as long as the fax is the oppisite (host-peer). This would be rare in fax servers. Probably you would use a E&M Tie trunk that will re-DTMF the digits accross the T-1 using the UDP routing tables. Think of the Fax server as a networked PBX. Most fax servers work this way or just use analog stations in a non-integrated VM hunt-group. You renumber adjunts to = your fax DIDs and cover them to the huntgroup The fax software will need to learn or know the Legend mode-codes to route the calls.