with some software modding (called freetz) it is possible to controll xbmc with a regular dect-phone:
a standard-service in freetz is the callmonitor.
this service is able to send messages to xbmc, dbox and some other frontends if someone calls you.
and... it is able to send http-codes (or push scripts):
out:request ^ ^032 wget "http://192.168.1.20:8080/xbmcCmds/xbmcHttp?command=PlayNext"
out:request ^ ^031 wget "http://192.168.1.20:8080/xbmcCmds/xbmcHttp?command=Pause"
in my case this means, calling "032" plays the next track.
031 ... Pause
now i've got a remote-controll with reaches 300 meters by using standard hardware.
my u-tube vid: