T.38 IP carriers?

[bfeeny at mac.com (Brian Feeny)]

Is anyone aware of a large (preferably tier 1 or tier 2) carrier that  
has a solid network that supports T.38 fax on-ramp and off-ramp  
services?
I have a client that needs to originate and terminate several DS3's  
worth of T.38 fax traffic and is trying to find a carrier that  
supports this.  I have a seen a list
on the voip wiki, but its less than impressive and a referral from  
this list would mean so much more.  Obviously said carrier would need  
to have a fairly robust
IP backbone, ideally that only dumps to T.30/PSTN on the local  
terminating CO, or as close to it as possible.

Brian