본 논문에서는 IETF IMPP WG에서 정의하는 프레즌스 모델을 살펴보고, 프레즌스 모델을 기반으로 한 서비스 개발시 각 컴포넌트 사이에 필요한 메소드 및 동작에 대하여 정의한 표준들에 대하여 기능별로 분류하여 대략적으로 살펴본다. 이 중에서 프레즌스 가입 및 통지 관련 인가 규칙에 대한표준 기술인 XCAP 표준을 대략적으로 살펴보고, 사용자 단말에서 지정한 가입자 인가 정보를 PA서버에서 얻어와 가입 요구에 대한 처리시 고려해야 할 사항에 대하여 기술한다.
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