Looking at thia a few years on from the original post
thread940-1801081
Now using R11.0 on the IP Office and the latest Version: 11.04.00.0038 on the CU360 I had to set
4) [user as the extension number and not the user.
I also replaced domain and FQDN with the IP Office IP address but that depends on your set up.
I set up all the user and extension passwords on the IPO to be the same just to be sure.
thread940-1801081
Now using R11.0 on the IP Office and the latest Version: 11.04.00.0038 on the CU360 I had to set
4) [user as the extension number and not the user.
I also replaced domain and FQDN with the IP Office IP address but that depends on your set up.
I set up all the user and extension passwords on the IPO to be the same just to be sure.