Here's an update on my FAX project:

On our main FreeSWITCH pbx (on CentOS), I run this command through the CLI and it works:

freeswitch@internal> originate sofia/gateway/flowroute/1408739xxxx &txfax(/home/schoch/fax000007603.tif)

I did a basic install on a Windows machine, by downloading the installer, installing it, and changing the "default_provider" lines in vars.xml in order to make it connect to our pbx. A "sofia status" shows it's connected.

Then I ran this command on the Windows machine:

freeswitch@internal> originate sofia/gateway/external::starnet_fax/1408739xxxx &txfax(C:/Users/Schoch/Pictures/fax000007603.tif)

It rang the FAX machine, but the FAX never got there. It got some sort of a timeout:

2013-01-22 14:09:10.224456 [DEBUG] switch_rtp.c:928 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=1

and

2013-01-22 14:10:07.744746 [DEBUG] mod_spandsp_fax.c:500 Fax processing not successful - result (2) Timed out waiting for initial communication.

I'm not sure where to go from here. Any ideas?

Steve