4PSA VoipNow Core is delivered with an API that enables the integration with third-party applications. 4PSA VoipNow Core is an Integrated Communications System for service providers and enterprises. It integrates voice and data into a single network infrastructure with an open standards software. The API allows the execution of basic management operations on all supported types of user accounts: resellers, clients, endpoints; charging plans and channels and call routing rules. The API uses SOAP protocol and responses are formatted in XML.