Click [Call Center]→[Area Code]，you can enter the page of area's code.The area is assigned with leading digits of the telephone number，also we can import the area list via [Call Center]→[ Import ]
Click [Add]，you will open the adding page of area code：
If you want delete all message of area code,just click the [Truncate] button.
The prompt which execute clear up the table via clicking “OK” empty will pop up after clicked [Truncate] button.
After completed the adding of area code,“The Number Attribution” will appear if the calls dialing into agent，as shown below：