With Fax Voip T38 Fax & Voice you may set up and use Windows Fax Service or any other third-party fax or voice application to send/receive faxes or audio messages via VoIP without hardware modems. Fax Voip emulates fax voice modems (Fax Class 1 protocol compliant). Virtual COM Port (modem) interface is a bridge between your fax or voice software and VoIP.
To configure your fax (voice) software, select the Fax Voip 14.4K TAPI Voice-Fax Modem device in the settings of your software. Depending on your software, you may need to specify the serial port instead of a modem. In this case, select the port associated with Fax Voip e.g. COM20. Also, you usually need to configure your software to automatically answer incoming calls.
Fax Voip T38 Fax & Voice has been successfully tested with many well-known fax and voice programs. To help you successfully configure your favorite fax software to operate with Fax Voip Virtual COM Ports (modems) we have written detailed instructions:
- Please note that after installation of Fax Voip version 8.1.1 or later, the Fax Voip modems are automatically configured for using with Windows Fax Service. Before configuring any other standard fax/voice software, you should manually disable sending and receiving faxes in Windows Fax and Scan (Fax Service Manager), see To configure the Windows Fax Service.
- (* : When using Microsoft Fax and Windows Fax and Scan, we currently recommend you to use our new solution, Fax Voip Windows Fax Service Provider (Fax Voip FSP), which was released in 2017. Fax Voip FSP replaces the standard Microsoft Modem Device Provider by the Fax Voip T.38/G.711FAX Device Provider. This allows you to use the Windows Fax Service most efficiently. In particular, the ECM (Error Correction Mode) is supported. The busy signal is also detected correct way. Fax Voip FSP implements Fax Voip FSP Routing Extension that is integrated into the Windows Fax Service. Fax Voip FSP stores the Called Number (DID) in the Routing Information field, which is available in particular in the Windows Fax and Scan software, in the incoming fax properties (no workarounds are used). Using Fax Service Provider (FSP) instead of Virtual COM Ports and modems significantly improves reliability of your fax system.