[Asterisk-Users] T1 Line install.. (UK Muppet)

[Andrew Kohlsmith]

> > - Supervision
> >     Loop Start, Ground Start, Reverse Battery, E & M
> >     "DNIS - Dialed Number Identification service"
> >     Not applicable with DS0 Analog Line trunks.
>
> You will probably want E&M as you get good answer detection and hangup
> detection and the easy ability to add DID info to it.

I always wondered what difference this made on DS1 interfaces -- you're either 
getting the signalling from the robbed bits or from the D channel, depending 
on whether you're using ct1 or PRI.  How are these supervision options 
changing anything at all in the DS1 bitstream?

-A.