One of the most intelligent features created on software was the concept of destinations. The central idea of the concept of destiny is to regroup the numbers which we make or receive calls and to use these groups by setting entry route, outgoing route, permission, etc..
The destinations are divided into:
Pre-configured destinations
Are those which have already been configured in software. As an example, Fixed Local, Local Mobile, Fixed National, National Mobile Services, 0800, 0300, etc..
Custom Destinations
Are the ones set by the User and may be used for group numbers, such as:
The mobile numbers of the company's corporate plan
Phone numbers of customers
Phone numbers of suppliers
Numbers of specific cities

An example of using custom groups is giving permission to dial only the group of cellular plan company. Thus, users could not connect to other mobile numbers beyond this group.