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search  External Short Messaging Entity (ESME) is a term
originally coined by Aldiscon to describe an external
application that connects to an Short Message Service Center
(SMSC) to engage in the sending and/or receiving of SMS
messages.  SME is a term used in many cellular circles to
describe a network entity (mobile/cell phone) that can
send/receive messages. ESME (pronounced EZ-mee) is essentially
one of these but without all the wireless aspects; i.e. it is
connected via TCP/IP, X.25 or similar. On SMPP 3.4 protocol
specifications ESME refers only to external sources and sinks of
short messages as Voice Processing Systems, WAP Proxy Servers or
Message Handling computers, and it specifically excludes SMEs
which are located within the Mobile Network, i.e., a mobile
station (MS).[1]  Typical examples of ESMEs are systems that
send automated marketing messages to mobile users, voting
systems that process SMS votes (Pop Idol, Big Brother), etc.
Basical