The paper investigates the capabilities of Parlay X Web Services for Policy and Charging Control (PCC) in managing all Internetprotocol-\r\nbased multimedia networks (IMSs). PCC is one of the core features of evolved packet networks. It comprises flow-based\r\ncharging including charging control and online credit control, gating control, and Quality of Service (QoS) control. Based on\r\nthe analysis of requirements for PCC, the functionality for open access to QoS management and advanced charging is identified.\r\nParlay X Web Services are evaluated for the support of PCC, and some enhancements are suggested. Implementation aspects\r\nare discussed, and Parlay X interfaces are mapped onto IMS control protocols. Use cases of Parlay X Web Services for PCC are\r\npresented.
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