T1 / Dial-Up Software[Kind of long]

[Ryan Moe]

This doesn't necessarily pertain to FreeBSD(although it will depending 
on what kind of answers I receive) but it's interesting nonetheless.  I 
work for an ISP and one of the services we offer is dial-up internet.  
Our 3COM hardware( the CSU/DSUs and the DSP cards)  is on its last legs 
and requires frequent reboots.  I've noticed that you can purcahse T1 
cards that support up to 4 T1 lines and contain the CSU/DSUs on them for 
a few hundred dollars.  The problem is that you then have to get DSPs 
for them and that raises the cost to around $5000.  For $5000 we can get 
more shitty 3COM hardware than we'd know what to do with, so thats not a 
good solution.  I was thinking, why can't the DSPs be emulated?  Does 
anybody know of any software that will emulate some number of DSPs(92 
would be the max for 4 T1 lines) and interface them with a CSU/DSU?  If 
no software exists what brand of hardware do you recommend for this type 
of application.  There seems to be only about 6 companies that make this 
stuff and none of them seem that great.  I appreciate any feedback I 
recieve.

Thanks,
Ryan