XONTEL Plus PBX, User Manual

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3.7.2
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.
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.
3.8 Function of RST Button
Press the RST button for different time length, and the XonTel Plus device will execute different function:
1. On the condition that the device is running normally, press the RST button for 3 to 6 seconds, the login password
of the device will be restored to the factory default, and the network mode will become the route mode, with WAN
address obtained through DHCP and LAN IP address defaulted as 192.16.11.1 . At the meanwhile, the access ports of
Http, Https, Telnet and SSH are restored to the default settings.