ETAP is a simple way for delivering wireless messages, both one and two-way, to appropriate receiving devices such as pagers and cellular phones. In its simplest form, ETAP provides a simple way to send a page to a TAP/IXO paging terminal. When operating in the 2-way ETAP mode, you will be receiving end-to-end acknowledgments and replies from a two-way messaging device such as ReFLEX units.
Several Digital cellular carriers support this protocol have been in use for well over a year at several commercial companies.