In this module we will see how to Enable Enforce CID Block in Trunks,
Go to Routing → Trunks → Egress/Ingress
Below displayed window will appear.
Click on Edit Icon on any of Trunk on which you want to Enable Enforce CID Block.
Trunk Edit window will appear.
Screenshot: Trunk Edit Window
On the Trunk window, check on Enforce CID Block to Enable it.
After checking the icon, click on SUBMIT button to save it.
Follow same procedure for both Ingress & Egress Trunks.