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SMPP

The Short Message Peer to Peer Protocol (SMPP) is a socket-based, open industry protocol, designed for sending 2-way SMS traffic. SMPP is the recommended connection interface for clients who are already familiar with this protocol or the detailed options of an SMS.

It is used to allow third parties to submit messages, often in bulk. It is a session-based peer to peer protocol.  'Session based' means a customer has to establish a connection to the SMS provider and use this connection to send or receive messages. 'Peer to peer' means that both the customer and SMS provider (i.e. the peers) may use operations defined by the SMPP protocol, depending on the type of session.

Authentication is done during the set up of this connection. After the initial authentication, the session between the customer's system and the SMS provider's system (i.e. the peers) is kept open and alive.