Examples are disclosed for exchanging messages between a switch and network devices having inputoutput devices. In the illustrative embodiments, the apparatus comprises a processor that prompts the user to optionally specify one or more acceptable alternative message delivery mechanisms, andor one or more alternative devices when a user refuses an incoming message. The at least one least significant bit of the digital audio sample is placed into a variable-length least significant bit packet having a low transmission priority for transmission over the packet-switched network. The resulting nanocomposite material can be used to produce revolutionary products such as water soluble elemental metals, with specific applications including magnetic resonance imaging, catalytic, magnetic, optical, photolytic and electroactive applications. The analog-to-digital converter inputs a difference between the first and fourth analog signals, and outputs the second digital signal representative of the first analog signal with the fundamental frequency component removed. The GUI can be configured to control the display to visually associate a reply short message with a given short message identified in the reply short message.