In inbound call centers with high volumes of incoming calls, customers frequently are required to wait in queue or required to be put on hold. Such a scenario creates a bad customer experience. As such call center companies employ callback messaging. It is a service that helps callers to a call center to record their personal contact information and request a call back from a call center agent when he gets free. The advantage of callback messaging is that it places the caller in queue and is provided assistance the moment an agent gets free.