NEWS from 

Kevin at ipDTL recently announced the service’s new ISDN functionality  for users to dial up an ISDN number. He also stated  that ipDTL was also working on the ability to receive an incoming ISDN call. Well, that’s now ready too.

You’ll find an updated guide here.

Meanwhile, if you haven’t used ipDTL for a while, you might find their latest video tutorial handy.