PBX (or something) for modem testing

[Jim Brain]

On 12/4/2019 7:47 PM, David Kuder via cctalk wrote:
> If you go the Pi route, a ADIT600 is a good option. Get one with three FXS
> 8C cards and a VOIP Router card. This works great for upto 28.8 / 33.6 from
> my experience.

Been reading up on all the units.  On this one:

Do you have to have a VOIP card?  I just want to talk within the PBX.

Where does one source those connectors for the various lines?

Can an 8B card be OK (I see some on eBay)?

JIm