To achieve this, begin by crafting an empty IVR menu within the RingCentral admin portal. Following this, modify your current IVR menu to redirect users to the newly established IVR menu when they press the designated key. Proceed by generating an advanced automation in Workflow Builder, utilizing the trigger "Call received," and configuring the action "send SMS" for the extension connected to the empty IVR menu. This seamless integration will enable the desired automatic SMS response when a key is pressed on the IVR menu.