The short message peer-to-peer protocol (SMPP) is a telecommunications
industry protocol for exchanging SMS messages between SMS peer entities such as
short message service centers. It is often used to allow third parties (for
example, value-added service providers like news organizations) to submit
messages, sometimes in bulk.
The protocol is based on pairs of request/response PDUs (protocol data units,
or packets) exchanged over OSI layer 4 (TCP/IP session or X.25 SVC3)
connections. PDUs are binary encoded for efficiency.
The most commonly used versions of SMPP are v3.3 (the most widely supported
standard) and v3.4, which adds transceiver support (single connections that can
send and receive messages). Data exchange can be synchronous, (each peer waits
for a response for each PDU being sent) or asynchronous (messages are received
and transmitted in independent threads with the use of buffers and timers). The
latest version of SMPP is v5.0.
to know details about SMPP; please refer https://www.watchguard.com/help/docs/ssl/2/en-US/Content/FAQs/configure_smpp_faq.html
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