I am trying to set up t38modem on an asterisk 11 system with Hylafax. The system is fully working with IAXmodem but I find I am getting too many errors. I have successfully compiled the latest version of t38modem and it appears to run properly. I have it registered to SIP and working with faxgetty. My problem is that I can't get it to successfully connect with another fax. I keep getting 'busy signal detected' errors when sending even though the call goes through and the other end answers. I also get 'no carrier detected' when receiving. It appears to be a configuration issue but I can't find very much information on configuration. I am looking for the proper parameters to use in launching t38modem and setting up the faxgettys. Thank you.