Hi,
1. Default Outdial
When you configure your mobile number or any external number as your notification device to get message notification call, those number restriction is controlled by 'Default Outdial'.
2. Default System Transfer
While playing any call handler, by default number known to unity is allowed to dial. But if the dialed number is not known to unity, that must be allowed under 'Default System Transfer'. Needless to say, routing to unknown numbers flag under greetings should also be enabled.
3. Default Transfer
Transfer number configured under user personal transfer rule must be allowed in 'Default Transfer' restriction table.
- Vivek