I tried out the newest t38modem v2.0.0 with the opal library on this project, used the latest libtiff from CentOS (libtiff-3.8.2-7.el5_6.7) and compiled everything. I used spandsp-0.0.6pre18. All works against Asterisk 22.214.171.124.
I have compiled everything and it seems to be working with outgoing faxes quite well both internally and through a PRI channel.
I use efax because I have to manage the queue and transmission manually and prefer not to use Hylafax.
Receiving faxes is a different story. While the sender reports the transmission as successful, reception fails just after the first page is received.
The received image is readable and without errors. If the fax contains more than 1 page, only the first is received.
I have collected some output from the loop test I have made.
The command I use to run t38modem is:
/usr/local/t38modem/t38modem -tttt --sip-old-asn --ports rtp:19000-19200 --sip-disable-t38-mode -u user --no-h323 --sip-listen udp\\$10.0.0.1:6060 --sip-redundancy 3 --ptty +/dev/ttyT38-1,+/dev/ttyT38-2 --route \"modem:.*=sip:<dn>@10.0.0.4:50660\" --route \"sip:.*=modem:<dn>\"
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