No, there should not be any outstanding
issues, and net5 is the normal choice.
Here is one point found in our archives:
"The only 'gotcha' that I am aware
of, and this applied to the 'old' Australian
ISDN, was that Telstra's billing software
could only handle the ISDN call being placed in
ONE direction. I don't know if this applies
to the 'new' European ISDN services.
So, try and set it up to call from
the 'A' end to the 'B' end."