Systems, methods and computer program products for enabling integration between various internet- or non-internet based communication services (e.g., as provided by different communications platforms and service providers) using a universal platform are described. In some implementations, a service manager is provided that can integrate call management capabilities with multiple communications platforms using the universal platform to enable seamless communication between the various platforms. For example, interactions between individual users on one or more platforms can be tracked in a single conversation history as a threaded interface. The universal platform can integrate with various platforms and third party protocols and services to provide call features that include, for example, call forwarding, call handling, multiple greeting prompts, call screening rules, ring-out rules, international calling, caller ID rules, after hours, and announcement prompts.