I have a very specific requirement to test ISDN PRI interfaces for protocols like Q.931 and specific protocols like ARINC 746.
I was wondering if there are any open source tools these the above protocols. Likes of Asterisk on a Linux Box having PRI ports?
I don't know the details of the protocols you mention, but Asterisk has an impressive debug output of ISDN details when you run it with one of the Digium cards. I hope this helps.