What is SMPP?
Also known as: Short Message Peer-to-Peer
SMPP is the binary protocol used between SMS gateways and mobile network operators to exchange messages at high volume over a persistent TCP connection.
SMPP predates REST and is built for throughput: a single bind can carry many messages per second, with delivery receipts returned over the same connection. It is what sits behind almost every SMS API.
Applications rarely speak SMPP directly any more — maintaining binds, windowing and reconnection logic is significant work. A REST API over the top gives the same delivery with far less operational overhead.
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