Calling system and method

The invention discloses a calling system and a method. The system comprises a calling function module set and a unified service capability invoking functional entity, wherein the calling function module set is used for sending an invoking service capability request message to the unified service capability invoking functional entity; the invoking service capability request message carries a target service capability indication and a key parameter for invoking the target service capability; and the unified service capability invoking functional entity is used for receiving the invoking service capability request message and invokes target service capability according to the service capability request message. According to the calling system and the method, the complexity for the calling system in the realization of various service capabilities is lowered.