NL1901ACV Enhanced Hybrid 4G LTE Gateway – User Guide
UG01063 v. 1.0 December 2018
5 Now all three parties are in a three-way conference.
T.38 Faxing
To enable T.38 faxing, select Enable T.38 support on the Voice--SIP Advanced Setting page. After that,
connect a fax machine to a FXS port of the DSL gateway. Now you can use it as a normal phone, and it is able to
send or receive fax to or from other fax machines on the VoIP network.
In the initial setup, faxing behaves like a normal call. After the DSL gateway detects the fax tone, it switches to T.38
mode, and uses it as the transmit approach.
Check with your VoIP Provider if your service supports T.38 Faxing.
Pass-Through Faxing
If T.38 support is disabled, faxing uses normal voice codec as its coding approach. Therefore, this mode is more
like normal phone calls.
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