In 2025, the development of AI voice agents is significantly enhanced by orchestration tools, which seamlessly integrate essential components such as speech-to-text, large language models, and text-to-speech technologies. These tools are pivotal in transforming impersonal IVR systems into conversational interfaces that can understand natural language, maintain context, and deliver human-like responses. As 70% of contact centers aim to implement voice AI by the end of 2025, six standout orchestration platforms offer unique advantages: Vapi combines visual design with API flexibility, LiveKit and Pipecat provide open-source customization, Retell emphasizes natural conversation flow, Synthflow enables no-code deployment, and Bland focuses on self-hosted security for sensitive data. AssemblyAI's speech-to-text API plays a crucial role in these systems, offering ultra-low latency and high accuracy for seamless conversational experiences.