asterisk users - Feb 2006 - Generating Polarity Reversal on FXS line

Hello list,

Is it possible to send polarity reversal signalling on FXS lines in Asterisk
using  the TDM240X cards?

I need to send that signalling to legacy PABX using TDM boards of my
Asterisk box.

The unique clue I could find was:

http://lists.digium.com/pipermail/asterisk-users/2004-December/thread.html#77646

Thanks in advance,

Daniel Pizarro
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