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Is it possible to block specific numbers from calling in on a PRI? We are using a CS100?
Not through the system , your dial tone provider might be able to help you out.
They can't do it either. Is there a 3rd party device that I can put before the PRI to trap the calls?
what kind of lines are you using on the CS 100 ?? If you are using a PRI it probably will not work
this might work https://www.privacycorps.com/products/?id=20
We are using a PRI. I can find lots of solutions for POTS lines, but nothing for PRI
You may want to give these people a call, It sounds like what you are looking for, might get a little more info from them if you call

https://www.sonictelecom.com/english/products/voip/ipx3.html
Thanks, unfortunately they're in Germany.
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