A route plan consists of one or more trunks and it controls how CenturyLink delivers calls to those trunks (known as inbound traffic).
You control your outbound traffic by how your configuration and equipment points to our trunks. To manage your outbound traffic, create new plans for one or more of your enterprise trunks. You can also add descriptions to your route plans to make it easier to differentiate them.
To create a route plan for SIP trunk service:
Control Center displays a list of all services assigned to the accounts under your enterprise ID. If you have more than 10 services, you can view the rest of your services by clicking one of the blue linked Show numbers at the top of the list or you can click the blue down arrow at the bottom of the list to add 10 services at a time to the view.