8.2计费原则8.3计费话单生成原8.4话单合并设备容灾和备份要求539.1 YD/T 2628.12013OCSOnline Charging System在线计费系统P2PPeer-to-Peer点对点技术PCCPolicy and Charging Control策略和计费控制PCEFPolicy and Charging Enforceaent Function策略和计