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When the telecommunication industry is moving from the traditional PSTN network to the SIP-based soft switch network, a new billing system of AOCE solution becomes the promising value-added service, to which the design and development of the SIP-based application server is the key. On the basis of the analysis of the SIP protocol and the separation process of the foreground from the background, the billing application server of AOCE SIP Serve is designed and implemented, of which the front processes the SIP stack, records the call information, calculates the bill and sends the bill to the calling terminal. The background program implements the functions including maintenance, alarm, diagnostic testing, protocol tracking, call tracking, performance statistics. A number of experiments have been performed in our NGN lab, with a satisfactory result.