Question : Which Analog Telephone Adapter has the best power supply on the analog ports?

I have installed tweny or so Linksys PAP2T-NA ATA's.
One of them is connected to a legacy half mile long twisted pair.
The PAP in this position has failed twice, it gets very hot.
I need a 2 FXS port ATA with a power supply which can handle this.

Answer : Which Analog Telephone Adapter has the best power supply on the analog ports?

Any chance that this is a problem of RF feeding back down the lines and causing the overheating?  Older equipment with transformer outputs was not sensitive to RF on the lines but newer equipment with solid state outputs often has been.  I'd be surprised if the Cisco engineers ever thought that unit would be used like you're using it.