DSL line stealing when there is no tone - DANGER - Operational content

as for relibility, I cant tell you the number of times a Verizon tech, would be out to install a phone line and steal one of our dsl lines cuase it did not have a tone.

As a (serious) question, why not stick a tone on it? How much can an oscillator at the CO plus some trivial passive low pass filters (one set per line), cost? (Or, if you aren't the DLEC, stick it at cust prem). Just don't use the trace tone... (translation to US terminology may be required) -- Alex Bligh Personal Capacity