i currently have a network with BC.7.2.1 using TLU76/1 with QSIG to a BP250 R12. Basic call setup operates satisfactorily but there is little functionality apart from this. In this network the MD110 is acting as the ISDN Master on the link to the BP250. The MD110 is also the clock source for the route.
If you only want basic call functionality with QSIG
then BC7.2.2 is O.K.
You are right that E1 ISDN will be O.K.
But if you want full QSIG functionality then
minimum is BC9 and even at this version you can have problems depending on the type of PABX you are interworking with.
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