To add the new box to your dashboard you would have needed to dial **5 nnnn (where nnnn are 4 digits given on the dashboard). Are you saying that the OBi gave no dial tone at that time but dialling **5 nnnn was successful nevertheless? Or are you saying there was dial tone when you did that but it disappeared at a later stage?
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Although the Obi gave no dial tone and dialing the ***5nnn it was successful. No dial tone before or after doing this.
Another phone that was tested at a friend's house as working was installed with the old box in place as it was with the installation of the new.