Described are techniques for providing broker services to consumers and service providers based on telephonic call-back engagements. The techniques include receiving a telephonic-based communication from a consumer to consult with a service provider and determining a suitable service provider to reply to the telephonic-based communication from the consumer. The techniques add an entry corresponding to the consumer to a queue maintained for the suitable service provider, and when the consumer in the queue is at the top of the queue, initiate a call-back to a device used by the consumer.