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TekFax is a SIP (Session Initiation Protocol) fax receiver server (Based on RFC 3261) runs under Windows (Windows XP, Vista, 7/8/10, 2003-2016
Server).

Features:

Simple, easy to use interface.
UDP, TCP and TLS transports for SIP signalling.
TekFax can forward incoming faxes to configured recipients via e-mail in TIFF format.
Supports UPnP for NAT traversal. You can also set external IP address manually.
Quick and easy installation.
Runs as a Windows service.

TekFax uses UDP port 5012 and above for T.38 traffic. You need to add necessary mappings to your router for incoming T.38 traffic if TekFax installed behind a NAT gateway which does not support UPnP. TekFax provides many messages when problems occur. You can see error messages on TekFax Status bar or in the log file of TekFax service. You can enable logging in Settings Tab. There are three levels of logging; None, Errors, Sessions. If you select Errors TekFax logs just error messages. If you select Sessions both Session and Error messages will be logged. You have to save or apply settings changes if you change logging level setting. Log files are located under Logs directory.