Integration of call signaling and resource management for IP telephony

One challenge to realizing a robust Internet Telephony service is the need to integrate resource management with a call signaling architecture. Also important in deploying the service is the need to preserve user privacy and security. The Distributed Open Signaling Architecture meets these requirements. DOSA establishes a framework for coordination between call signaling, which controls access to telephony-specific services, and resource management, which controls access to network-layer resources. The authors describe the architecture and an implementation approach that has proved viable in detailed simulations from real usage data.