You have posted only a portion of the log that is not very helpful to find the problem. But anyway, this shows that your web2fax is working fine as far as the ICTFAX is concern. It seems to be a codec issue of your gateway (trunk provider). By default, ICTFAX uses G.711 to send faxes. If your provider supports T.38, then you should read this http://forum.ictfax.org/viewtopic.php?f=12&t=2472&sid=13974cc51be2a4cafab7e71264ee4e52
As far as email to fax is concern, first check that your sendmail received the email that you sent. If the sendmail has received the email, then you should check whether drupal cron is reading the incoming emails and converting them to fax.
This is the way to solve the problem. I hope this helps.