The present document investigates how the OSA Call Control Interface Class methods defined in  can be mapped onto SIP methods.
The mapping of the OSA API to the SIP is considered informative, and not normative. An overview of the mapping TR is contained in the introduction of the present document as well as in TR 29.998-01
The OSA specifications define an architecture that enables application developers to make use of network functionality through an open standardised interface, i.e. the OSA APIs. The API specification is contained in the TS 29.198
series of specifications. An overview of these is available in the introduction of the present document as well as in TS 29.198-01
. The concepts and the functional architecture for the Open Service Access (OSA) are described by TS 23.198
. The requirements for OSA are defined in TS 22.127