As SMS messages became effective mobile marketing tools, enterprise messaging, also known as application-to-person messaging (A2P), gradually gained traction. The two-way messaging service is a branch of the enterprise messaging portfolio. This interaction-based messaging leaves an impression on your target audience. To deliver text messages to mobile users, two-way SMS messaging employs predefined keywords and shortcodes. To receive an automatic response, end users must transmit a keyword to a short code, such as 23232.