IAX DID from DAHDI ... possible?

Again… am running AsteriskNOW ver. 1.5 with updated asterisk to 1.6 on a Dell PowerEdge 1950.

Have been struggling for a couple months now with the IAXmodem.

How does it get a did number? Can I output my DAHDI DID channel to the IAXmodem?

We would like to use this with Hylafax. But need a IAX number.

Thanks in advance,