Nexo FXO-128o, User Manual

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3 Basic Operation
3.3 Send or Receive Fax
3.3.1
Fax Mode Supported

T.38
（
IP-based
）

Pass-Through （ VBD)

Adaptive Fax Mode (automatically match with the peer fax mode)
3.3.2
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.
Adaptive Fax Mode: automatically match with the fax mode of the peer device.
3.4 Local IVR Operation
3.4.1
Inquiring the IP address
Connect a PSTN line to one of the FXO ports of the gateway, and then use a mobile phone or
a fixed telephone to dial the number of the PSTN line. After you hear a dialing tone or a voice
prompt, dial *158# to inquire the IP address of the gateway.
3.4.2
Factory Reset
Connect a PSTN line to one of the FXO ports of the gateway, and then use a mobile phone or
a fixed telephone to dial the number of the PSTN line. After hearing a dialing tone or a voice
prompt, dial *166*000000#, and you will hear
“
successful setting
”
, then hang up the
phone and the gateway is reset to factory defaults.
Gateway-128o User Manual 15