With the rapid development of CTI and VoIP technology, more and more attention is paid to the voice mailbox based on VoIP which is a kind of important telecom value-added service. In order to reduce the voice mailbox system development cost and shorten its development cycle, a solution of the voice mailbox system based on digital voice card and VoIP is put forward in this paper. This paper introduces the system architecture of the voice mailbox system based on VoIP, clarifies the system function, and describes the realizations of schedule delivery message and manual service in detail. After the system running, the effect of it is good. It has a certain guiding significance to the relative projects' development based on digital voice card.