> I think that most T1 lines are set for B8ZS with ESF. I also think that
> channelized T1 (as opposed to PRI) uses robbed bit signalling (the so-called
> A B bits) to indicate conditions such as on/off hook and ringing.
> It is a form of in-band signalling.
>
> How does this play into the picture?
robbed bit is AMI/D4 coding
ringing and on/off hook conditions happen using FXS signalling (ie, wink
start etc)
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