Plain-language definition
Any application or system that connects to an SMSC or gateway over SMPP.
Technical definition
An ESME binds with a system ID and password in TX, RX or TRX mode; the gateway applies per-ESME throttling, routing, IP restrictions and firewall policy.
Why it matters
ESME accounts are the control point for aggregator and enterprise traffic and the target of the embedded ESME firewall.
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.