[asterisk-users] Maximum cable length for analog phone from FXS port

[Wilton Helm]

[snip]

>You may be able to boost the battery voltage with a simple dc adapter in 
>series to get the line build out capability you need. Just make sure its 
>floating with respect to ground and wire it in. Don't be afraid of 
>hurting the phone, you won't.

But it is possible to hurt the ATA if it causes more current than expected
to flow.  It is even possible to force reverse voltage into the ATA that
way.  A line fault would make it even more likely.

Wilton