In this chapter, you have learned why it is important to have a user and administrator portal. It is a piece of software to which you should pay a lot of attention. Several VoIP providers fail to allocate time and resources to the important task of building the portal. OpenSER is an amazing SIP proxy, but a SIP proxy is just one of the components in a VoIP Provider. Without a good administrator and user interface a VoIP provider project can easily fail. SerMyAdmin is our contribution to your project. Developed in Java using Groovy on Rails it is licensed according to GPL version 2. You have learned how to install, manage users and domains, and how to customize the appearance. The tool can do a lot more things, and we will show it again in the next chapters in some other tasks.