SMPP

The short message peer-to-peer protocol or SMPP is a telecommunications level-7 TCP/IP protocol enabling quick delivery of SMS messages, switching them between SMS peer entities. It is designed to provide a flexible data communication interface for the SMS transfer between External Short Messaging Entities (ESMEs), Routing Entities (REs), and SMSC.

SMPP is often used to allow third parties to submit bulk messages but may be also used for SMS peering. Because of its versatility and support for non-GSM SMS protocols, this is the most commonly used protocol for short message exchange outside SS7 networks.

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