Short Message Peer-to-Peer Protocol (SMPP) is an open message transfer protocol that enables users to interact with an SMSC. The protocol defines the information which needs to be exchanged between the user and the SMSC and the operations associated with the exchange of SMS messages. Every request made using SMPP has an associated response.
It is used primarily for connecting third-party services with SMSCs to enable various types of automated SMS services.
Refer to the SMPP documentation on our developer documentation site for more information.