Startup Siro has secured $50 million in a Series B round led by SignalFire with participation from Dick Costolo and Adam Bain’s VC firm 01 Advisors. Siro transcribes sales meetings via an app. Features include a company-wide dashboard where sales folks can submit successful calls and sort them by engagement from peers, allowing other reps to listen to top calls and get insights about improving on-ground sales visits. Siro trains models for specific industry verticals — for example, for HVAC sales coaching. The company also uses a general-purpose model to gauge how a salesperson is building rapport and handling rejections. Wayne Hu, a partner at SignalFire, said that the VC firm always wants to invest in companies that have a strong business advantage in data for particular segments. “Siro’s solution is helping digitize the ‘dark matter’ of offline conversations comprising field sales engagements, which has broad extensibility across verticals and depth in downstream actions that can be instrumented from this data, such as customer and product insights,” he told.