Plain-language definition
The protocol applications use to send and receive SMS through an SMSC or gateway.
Technical definition
SMPP v3.4 and v5.0 define bind_transmitter, bind_receiver, bind_transceiver, submit_sm, deliver_sm, query_sm and delivery-receipt conventions over TCP; SMPPS adds TLS.
Why it matters
SMPP is the lingua franca of A2P; ESME firewalls and enterprise gateways are built around it.
Last reviewed 2026-09-12 by the Guardivia QoS Engineering Team. Product facts on this page describe current capabilities; items marked “where supported”, “optional”, “integration” or “consultancy” are confirmed per deployment.