Abstract: Implementing a unified communication system allowing different clients to communicate using different communication modalities to access the same functionality of a remote application. A method includes identifying functionality of an application of a service. The method further includes determining a plurality of communication modalities that can be used to access the functionality of the application of the service by identifying communication modalities identified by a developer as being communication modalities that can be used to access the functionality of the application of the service. The method further includes, based on identifying a plurality of communication modalities that can be used to access the functionality of the application of the service, determining that the functionality of the application is supported by a unified communication function. The method further includes at runtime mapping operation of the plurality of communication modalities to the unified communication function.