Category Archives: FreePBX

T38 on Asterisk

To enable T38 on Asterisk, add the following to the files listed.

sip_custom.conf:

t38pt_udptl = yes

udptl_custom.conf:

udptlstart = 4000
udptlend = 4999
T38FaxUdpEC = t38UDPRedundancy
T38FaxMaxDatagram = 400
udptlfecentries = 1
udptlfecspan = 3