Jul 26
SMPP is the reason high-volume SMS does not fall over at peak load.
Short Message Peer-to-Peer is a binary protocol, not an app. An ESME (your gateway or aggregator platform) binds to an SMSC (carrier side) over one open TCP connection and exchanges PDUs like submit_sm and deliver_sm.
HTTP sends one request per message. SMPP keeps the line open. That is why resellers and enterprises running OTP traffic across India, the US and Europe build on SMPP.
Learn binds, PDUs, window size, throttling and DLR in plain language: https://smppcenter.com/learn/what-is-smpp/