Fax on NBN not working - solved

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Despite widely advertised promises that 'NBN will boost your business' FAX machines do not always work with NBN! Companies which requiring faxes for daily operations are offered either use email or go third party email to fax providers such as eFax.

You may try connecting fax after NBN modem parallel to NBN phone. If NBN modem is not compatible with your fax machine fax will dial but will give connection/communication error. Telstra test fax number is 1300368999. Telstra test will accept your FAX and send it back in a minute with test details such as error rate.

Some NBN modems supplied by ISP work some not, NetCom NF4V, for example, does not.

The solution is using dedicated VoIP phone adapters such as Cisco SPA112. Connect VoIP adapter to NBN modem with Ethernet cable. Disable VoIP account in the NBN modem.

fax-on-nbn-connectionsfax on nbn connection with VoIP phone adapter

fax-on-nbn-Cisco-SPA112-settingsCisco SPA112 settings for Business Class Telecom - next talk - iPrimus

ISPs support kindly suggested using VoIP adapters with G711, and T38 codecs, lower the baud rate, disable ECM (Error Correction Mode). Despite that Cisco SPA112 and NF4V have both codecs, only Cisco worked, even with T38 disabled. I have not tested other modems supplied by other NBN providers yet.

Second NBN surprise is that back to base alarms are not supported by NBN too. I've had one call so far. They have house alarm disconnected without giving an alternative. Although a security company should provide the internet only solution, I wonder how many properties become unsecured due to transition to NBN. Besides, the internet is less reliable than a phone line.

The solution for back to base alarm on NBN is the same as with the phone - connect alarm after the NBN modem or change alarm to the network-enabled one.

Other issue is that NBN does not support multiple phones in the house or business - modems are not designed for it. You may try continuing using your old fax, back to base alarm and extension phones by connecting all phone lines parallel to the phone output of your new NBN modem.

The success depends on type and number of devices you use. Make sure phones are not connected now to the NBN line from the street. This NBN line must be connected to the NBN modem input and nothing else.

  by Dimitri,   Tags: