GW0017 User Manual
16
3.8
Send or Receive Fax
3.8.1
Fax Mode Supported
⚫
T.38
（
IP-based
）
⚫
T.30
（
Pass-Through
）
⚫
Modem
⚫
Adaptive Fax Mode (automatically match with the peer fax mode)
3.8.2
Explanation of T.38 and Pass-through
T.38
is an
ITU
recommendation for allowing transmission of
fax
over
IP networks
in real time.
Under the T.38 mode, analog fax signal is converted into digital signal and fax signal tone is
restored according to the signal of peer device. Under the T.38 mode, fax traffic is carried in
T.38 packages.
T 3.0 (Pass-through)
: Under the pass-through mode, fax signal is not converted and fax
traffic is carried in RTP packets. It uses the G.711 A or G711U codec in order to reduce the
damage to fax signal.
Adaptive Fax Mode
:
automatically match with the fax mode of the peer device.
