asterisk users - Aug 2009 - Looking for recommendations - US SIP provider for T.38 Faxing

We recently completed a full migration of our office phone system over 
to Asterisk and are using flowroute & Broadvoice as SIP providers for 
our incoming/outgoing calls.  Everything is working great.

Now that the phones are done, I'm left with the fax machine.  Although 
we have been using jFax for digital fax handling for most of our fax 
needs, it falls short with many calls where the recipient fax machine 
takes ages to answer a call, or international fax machines aren't well 
supported.

I'm ready to move this over to Asterisk/SIP as well, and I know that 
Asterisk has a Fax solution available.  I'm just looking to find a SIP 
provider that gives really good results with T.38 fax handling (mainly 
outgoing fax calls).

Does anyone who has done this in the US have a recommendation based on 
their own personal experience?

Thanks in advance for any info.

Myles

-- 
======================Myles Wakeham
Director of Engineering
Tech Solutions USA, Inc.
Scottsdale, Arizona  USA
http://www.techsolusa.com
Phone +1-480-451-7440