SIP Gateway Links Configuring a SIP Gateway Trunk The "Numbers" Tab
 
The "Numbers" Tab
The following settings can be made:
Public numbers of this trunk
You can specify here which public numbers this trunk uses. External calls to these numbers go over this trunk. Calls with a Calling Party Number that is assigned to this trunk are routed over this trunk.
This is how you add numbers for this trunk
1 Click on "Add".
The “Public numbers" window will appear.
2 You can add either an individual number or a range of numbers.
3 End your inputs with “OK”.
To add several numbers or ranges, simply select "Add" the relevant number of times.