I created a PSTN device and created the configuration file. It resides in "C:\ProgramData\3CX\Data\Http\Interface\provisioning". The documentation at 3CX says to point... Profile Rule: http://192.168.1.100/management/provisioning/linksys3102.xml (192.168.1.100 is IP of 3CX Server) Also I tried a few other folder names but got nowhere. After I "Submit all changes" and go to PSTN Line tab it seems to have NOT picked up any configuration data - at least nothing that is vaguely similar to the manual configuration documentation at 3CX for the 3102. Linksys firmware is the recommended one by 3CX.