Various OMA service Enablers need the functionality to retrieve a list of addresses where the Users behind these addresses  fulfil certain Conditions set up by the service Enabler.

The CBUS Enabler originates from the need to support this functionality for features of the PoC service. The CBUS Enabler is a common standard solution to fulfil that need and making it available also to e.g. messaging, gaming, conferencing and advertisement services.

The Conditions are based on information elements related to the Users and where the information content is typically changing over time, for example presence status information and User's geographical location, and/or User's personal information. But the CBUS Enabler also allows the User to form Conditions based on information with more static duration, e.g. User's personal interests and hobbies, or a combination of both volatile and static information.   The type of information mentioned here is available from other Enablers.  The objective is to re-use existing standards and specifications for accessing information elements in the Enablers owning the information. The objective is also to provide a callable interface that can be used by other OMA service Enablers to re-use the functionality provided by the CBUS Enabler.