SIP Links Configuring a SIP 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.
For information about the public number and conversion into SIP-URI format, please refer to SIP-URIs.
This is how you add numbers for this trunk
1. Click on "Add...".
The following window appears: "Numbers".
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.