sentences:  HPE offers three service and charging platforms for telecommunication service providers.They include HPE OpenCall Service Access Controller for prepaid and postpaid voice and data services; HP OpenCall Service Controller, an open platform for constructing multi-network-based services and developing applications in 2G and 3G architectures; and the HP OpenCall Intelligent Network Server used for mission-critical operations like e911 on legacy wireline, wireless and next-generation communication systems.There are three HPE OpenCall signaling platforms.