The on-hook current limits are VERY low. Here are the US limits from
http://part68.org/SecureDocuments/TIA-968-A-Final.pdf .
4.7.2.1 On-hook resistance, metallic and longitudinal (up to 100 V dc).
The on-hook dc resistance between the tip and ring conductors of a loop
start interface, and between each of the tip and ring conductors and earth
ground, shall be greater than 5 MΩ for all dc voltages up to and
including 100 V.
4.7.2.2 On-hook resistance, metallic and longitudinal (100 V to 200 V dc).
The on-hook dc resistance between tip and ring conductors of a loop start
interface, and between each of the tip and ring conductors and earth
ground shall be greater than 30 kΩ for all dc voltages between 100
and 200 V.
Harold
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