Why a service provider needs to register?

Once you ('You' means a service provider. Please note that end user does not need to register) register, you will get an Operator Code. And later on, when your end users will download, they will only input your operator code instead of inputting all the technical data like your switch IP, Port, and IVR extensions. Even later on, if you need to change Switch IP/Port, you just need to change IP/Port of your company Dialer by yourselves; your client does not need to do those.