ABSTRACT
There are hundreds of standards development organizations (SDOs), some well known to the public and others only known in their relative areas. They are all created for a purpose, and each has its focus area. IP Multimedia Subsystem (IMS) started as the telecommunications standards to bring the Internet Protocol (IP) into a traditional telecommunications environment that is based on circuit switch technologies. When it comes to IMS-related standards development, the three SDOs discussed in this chapter play the most important roles and provide the biggest impacts.
