A streams controller monitors multiple data streams with speech of a conversation with multiple speakers and uses text analytics and diaritization to identify speakers by their role in the conversation. Diaritization is applied to the audio of a data stream to associate a speaker with an SSRC from the data stream and a speaker identification (ID). The streams controller then runs text analytics on a text version of the speaker's speech to determine a speaker role for the speaker. The speaker role can be used to efficiently monitor conversations in a data stream to provide additional services. For example, speaker role can be used to analyze calls in a call center and provide services such as a transcript of conversations or enhanced customer support.