Mitel Dect (Ascom) automatic backup

[Questionary]

according to the documentation, it is possible to automatically backup the base station configuration.
You need to set up a web server accepting HTTP PUT commands and enter following line in the HTTP tab :
mod cmd UP0 scfg

http://192.168.0.10/configs/saved/#h#b5.txt

no-op WEEKLY /force 168
The command above saves the device configuration file once a weekwith a backlog of 5 weeks.
The IP address is from the web server.
First of all, the #b5 parameter is not understood by the IP Dect base station (IPDect V6), second of all, wireshark does not show any activity from the base station IP on the web-server (running wireshark on the web-server).
Any ideas how to solve this ?

 

[Questionary]

Update :
The line"mod cmd UP0 scfg

http://192.168.0.10/configs/saved/#h#b5.txt

no-op WEEKLY /force 168" should be in a text file on the web-server. This file should be read in the Update-URL tab (not HTTP tab).
This works fine; however writing on the web-server (IIS7 accepting HTTP PUT) is still a struggle. Any suggestions ?