The URI for the Call Setup API starts with /call/<version>, where <version> denotes the version of the API. For the first official version of the API, <version> is 2.0, so the Call Setup API URI starts with /call/2.0.
Other path elements and parameters are required according to the action requested. In accordance with RESTful guidelines:
Mandatory resource identification information should be passed as elements of the URI path.
Optional information should be passed as request parameters.
