asterisk users - Oct 2003 - Real sip fax server

Hello,

Do you know a **real** sip fax server to _send_ faxes with Asterisk?.

By example: an employee sends a TIFF facsimile by email to the SIP fax server;
SIP fax server uses SIP to communicate with Asterisk; Asterisk communicates
with a Cisco SIP2PSTN Gateway via SIP; Cisco sends the fax to the PSTN.

I've read some posts than mention Hylafax, but it needs for real
modems/analogic lines: Hylafax Server + additional COM ports + modems + Cisco
ATA 186 + Asterisk. 

A very important limitation in the number of concurrent faxes that can be sent
in a while.

Thank you,
Mark