VS2000 handset registration problem
 

I am trying to register handsets to the base station, but two of my handsets seem to have the same hardwired number 5 and the base station will only accept one of them at a time. Does anyone know a way round this? e.g. is there a way to chnage the internal number of the handset? I have no handset number 1 at the moment (it failed) so I just need to change handset number 5 to handset number 1....