[Asterisk-Dev] Polarity Reversal ?

[Jon Pounder]

I was guessing he meant on an fxo type card in a channel bank attached to 
the E1 / T1
In which case I would also assume it is RBS used not D channel signalling. 
One of the C/D bits might be used for that by the channel bank. The various 
zap files I have looked at only support the A/B bits (ring and hookstate), 
but it should not be a huge job to add specific meaning to the C and D bits 
as well.

If anyone is up to this job, take care since I know in some applications 
C/D have their own meanings and in others they just mirror the A/B bits in 
the frame, so the mode they are used in must be selectable for any patch 
which is written.





At 10:48 PM 5/6/2003 +1000, you wrote:
>On Tue, 6 May 2003 17:27:07 +0530, Vinod Sankar wrote:
>
> >Hello,
> >
> >Do Digium E1 cards support polarity reversal to detect call answer ?
> >If not, is there any definite way of detecting call answer on the PSTN
> >side before sending a connect confirmation message to the IP side ?
> >
> >thanks,
> >Vinod
>
>I might way out of line on this.... BUT
>
>How the heck can you do a polarity reveral on an E1 channel ?? wouldn't
>the required signalling be actually on the data channel ??
>
>Your mention of PSTN in this context I find confusing as E1 is ISDN
>signalling...
>
>Gary
>.
>
>
>
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