On Tue, Jan 25, 2011 at 1:45 PM, Bryant Zimmerman <BryantZ at zktech.com> wrote: > Do you know how to force off T.38 in res_fax? it's in sip.conf take a look for t38pt_udptl=yes change it to no > reload sip on your console that should force it to either fail entirely or do audio passthrough.