Old telephone systems.

[KA5PIU]

Hello.

Tend to agree but this is old stuff
Got the partner plus to power up and connected 2 stations, it works to the level that I understand.
The bogen equipment does not work, or at least I have yet to have success.
And, yes, the Asterisk cage is most likely useless.
The VoIP adaptors, it depends on if they are locked to a carrier or not.

[KC2UGV]

Hello.

Tend to agree but this is old stuff
Got the partner plus to power up and connected 2 stations, it works to the level that I understand.

What modules do you have?

The bogen equipment does not work, or at least I have yet to have success.

It's a grounded system, so you need shielded wire to get it to work (Three terminals: Signal, Ground, Shield). And, it's 70V. Enough to knock a person off a ladder (I know from experience).

And, yes, the Asterisk cage is most likely useless.
The VoIP adaptors, it depends on if they are locked to a carrier or not.

Most likely, they aren't. If they are, possible they can be unlocked.