Call center quality assurance (QA) is undergoing a transformation through the integration of AI-driven technologies such as speech-to-text (STT) and large language models (LLMs), which are redefining QA processes by enabling real-time transcription and analysis of every interaction. This shift from traditional, manual QA methods, which rely on random sampling and are prone to human bias, to automated systems allows for comprehensive coverage, faster feedback loops, and consistent performance evaluation, thereby enhancing operational efficiency and reducing costs. AI-powered QA not only improves agent performance and customer satisfaction by providing timely and objective feedback but also helps in identifying inefficiencies and ensuring compliance with regulatory standards. To effectively implement these AI solutions, call centers must select accurate transcription engines, establish meaningful QA metrics, and maintain a blend of automated and human oversight to ensure accuracy and trust. Companies like Gladia are at the forefront of this innovation, offering specialized STT solutions tailored for contact center environments, leading to significant improvements in QA processing speed and accuracy, as demonstrated by their collaboration with Selectra.