I have Option 11C, Release 22.08 with ISDN PRI for DID. Inbound calls over the PRI to an analog DN ring in but the call gets dropped when the called party picks up the phone. If you define the DN to ALSO appear on a digital set button, the inbound call completes OK. We've worked around this problem for 8 years but now I need to use ACD and inbound DID calls to the lead ACD number are seeing the same treatment. I've done lots of troubleshooting including some D-channel traces and can share more details, but so far haven't found anyone who can help me.