SLNG is the global execution layer for real-time voice AI, sitting between orchestrators and voice AI models to optimize routing, caching, and regional compute. It provides a unified API for 30+ STT, TTS, and LLM models, enabling developers to reduce turn latency by up to 39% and model costs by up to 53% without changing their existing orchestrator, prompts, or provider contracts. SLNG is ISO 27001 certified, HIPAA compliant, and GDPR compliant, with 11 sovereign regional hubs for data residency enforcement.