I am having an issue with CUCIMOC when in computer mode (using CSF).
When I try to initiate a call through OCS (right-click, drag or keypad) I get a busy tone and the following error in the notification box.
Phone Error. The call cannot be connected. 
If I switch to Desk-phone mode, calls are passed through successfully.Works 100%.
I've tried recreating the CSF and relinking to the end-user. A DN is linked to the profile.
any ideas what it could be?