>         One should be careful about the type of load presented to a
> telephone line pair.  The equipment at the switch to which your phone is
> connected may range in complexity from rotary steppers and mechanical relays

So basically, your saying that there is no practical, recommended way
to cut off ringing from one extension on the inside wiring?  I
thought this might be the case, and I would have to set up the ring
blocker on the enterence point to the house.  Any other suggestions?