US Patent 11418649 Inbound and outbound communication session and call control

Computer program products, methods, systems, apparatus, and computing entities are provided for establishing supplemental communication sessions between a caller and callee of a voice-based telephone call. The supplemental communication sessions may occur via a unique URL generated for a call and provided to a mobile device participating in the telephone call. By accessing the URL, the mobile device user has access to content tailored specifically to the telephone call, such as a dynamically updated indication of a callback time estimate if the mobile device user requested a callback when a representative of a third party is available to participate in a callback.