How to use the pppd plugin from svn?

[van Schelve <public van-schelve de>]

Hello list.

I want to give the pppd plugin a try under my Fedora 8 installation. So I
installed the NetworkManager-0.7.0-0.6.6.svn3138.fc8 rpm and added the hal
stuff:

[root localhost ~]# cat
/usr/share/hal/fdi/information/20thirdparty/10-usbmodem.fdi 
<?xml version="1.0" encoding="UTF-8"?> <!-- -*- xml -*- -->

<deviceinfo version="0.2">
  <device>
    <match key="info.category" string="serial">
      <match key="@info.parent:usb.vendor_id" int="0x1199">
        <match key="@info.parent:usb.product_id" int="0x6804">
          <match key="@info.parent:usb.interface.number" int="0">
            <append key="info.capabilities" type="strlist">modem</append>
          </match>
        </match>
      </match>
    </match>
  </device>
</deviceinfo>


In my laptop (Lenovo x61s) there is a sierra wireless mc8755 installed.
After restarting hald, NetworkManager and the modem itself I see three
entries "GSM Modem" in the NetworkManager. But how do I have to configure
them to create a UMTS connection?