Toni,
Try the following.
1. Create a call handler based on the existing Operator call handler. On the Call Transfer settings page, set the Transfer to "Yes, ring this extension" and input the operator extension.
2. Create a Subscriber Template. On the Caller Input settings page, set the 0 key to "Attempt transfer for ". You can use this Subscriber Template when creating new subscribers for this location.
3. For existing subscribers, use the Bulk Edit tool in the Unity Tools Depot to change the Caller Input as described above.
Hope this helps. If so, please rate the post.
Brandon