So here's something I didn't know... ISDN Q.931 signalling is often abbreviated as QSIG.
Sufficise to say if you need an interface on an ISRG2 to connect to an ISDN circuit or another device using Q.931 signalling then this is the kind of card you need: VWIC3-1MFT-T1/E1
There is no information on the datasheet that I can see but here is a support forums reference:
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