Modem is Agere Systems M5457 winmodem.
Works fine using slmodem-2.9.2 driver. Running Mandrake 9.2 with custom 2.4.22-21 kernel.
From lspci: ALi Corporation Intel 537 [M5457 AC-Link Modem]
UPDATE: Doesn't seem to work with 2.6 kernels (as of June 2004) - have written to the developer of the slmodem software, who said that it was never really intended to support the (Agere) modem on the R40e, but had put the necessary code in because some people reported success (I suppose with a 2.4 kernel).
Bottom line is, I am pretty sure slmodem will not work with kernel 2.6 and the R40e. The developers plan is to eventually incorporate it into the alsa driver when time permits.
I also tried several other drivers on 2.6 with no success.
Probably the best thing to do is to have a 2.4 kernel to boot to when you need the modem, or as I do, use a PCMCIA modem when I am on the road...
Unless somebody out there knows differently or wants to code for the alsa driver - beyond my programming 'skills' I am afraid : )Please let me know if you have any luck, and I will amend this page if necessary.