| With the development of the telecommunication network and the increase of the telecommunication service, services such as offering the inventories of telephone expenses become more important and difficult for the carriers. Besides, with the aggravation of the market competition, carriers need management mechanism and market strategy to be more flexible. Traditional bill method in which tapes are used to collect bill file can't meet the demands anymore.Collecting bill files online means that the equipment uses a kind of file transfer protocol to collect bill files from an exchange through a data network automatically. It can overcome the shortage of gathering bill files from tapes offline, realize the centralized maintenance and management of the bill files, improve the real time quality, veracity, equity quality of the charging job, and improve the service facing the users. Along with the charge system and criterion being more perfect, the chance building an online billing system is coming.This paper analyzes the present situation of the telecom billing collecting system as core telecom business system and the necessity of building online billing collecting system. It constructs the conceptual model of online billing system software architecture according to request of billing collecting system and further explains billing collecting of S1240 telecom switch using IP card. This paper gives a detailed analysis on the three major problems in the billing collecting domain: the integrated software architecture of the billing collecting system, the billing file format conversion and the external interface. This paper defines the MML language based on the socket comnvunication as unified interfaces to related systems. To conclude, this paper suggests the technologies online billing might use in the future.
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