The conversation intelligence landscape encompasses various technologies, including text analysis, human-to-machine conversations, and human-to-human conversations. A closed domain system is built to understand specific types of conversations, while an open domain system can handle broad and versatile conversations with varying outcomes. Building a conversation intelligence system involves three stages: speech recognition, machine learning framework development, and continuous training and maintenance. The choice between a closed and open domain system depends on the scope and complexity of the conversation and the data sources available. An open-domain system offers more flexibility but requires more complex machine learning models, while a closed domain system is more practical for specific use cases but may be biased towards that domain. To build an effective conversation intelligence system, it's essential to gather high-quality training data, design a suitable machine learning framework, and continuously train and maintain the model to mitigate biases and improve accuracy.