Your service ID is the container for the locations, trunks, telephone numbers, and DID numbers provisioned for the service instance. Based on your particular implementation, you may have multiple service IDs in your list of services. There are two types of SIP trunks: usage-based and flat. Outbound long-distance service and toll-free service run on usage-based trunks. Local/bi-directional calls are routed on flat trunks. You can tell the difference between the two types of trunks by looking at the 10th character of the trunk group name. Usage-based trunks have a D in the 10th position, flat trunks have an L.
A route plan consists of one or more trunks, and it controls how we deliver calls to those trunks (inbound traffic). You control your outbound traffic by how your configuration and equipment points to our trunks. To manage your outbound traffic, you can create new route plans for one or more of your enterprise trunks. You can also add descriptions to your route plans—making them easier to differentiate, or you can modify their hunt type (e.g., sequential or percentage allocation). You can also add a friendly description to a route plan to help you more easily identify it in a list of plans. Route plans are typically in CURRENT status. When you make changes, Control Center changes the status to UPDATE until the changes are complete.