I have an IPO 406v2 @ 4.0.14. I upgraded from 3.2.55 to 4.1.12. After upgrade off site forwarding stopped, all you get is 5 beeps in a row like the line is not available. I downgraded to 4.0.14 this morning thinking it was a bug in 4.1, but the problem followed. I have tried work arounds and even opened a ticked with Avaya. No solutions yet. Any Ideas, I can't be the only one with this problem. Looking at the Monitor, i believe the IPO is inserting the wrong information in the ISDN layers to the network.