The Virtual Switchboard service let's you flexibly control your inbound call-flow works using a web based 'call-flow builder'. You can use it to create 'follow me' call routes, play callers information, provider a caller menu etc..
If you have a subscription to the switchboard on your it will be visible from the Services menu at the top of the page.
We have created a few screencasts to help you get started.
Creating a Simple Call Flowl