Jul 27
Same message. Two very different protocols.
SMPP = one open connection, bind once, stream thousands of messages per second. HTTP API = one request per message, integrate in minutes, no session to manage.
For a single app sending moderate volume, HTTP is often enough. For OTP at scale or running an SMS aggregation business in India, the US or Europe, SMPP is usually the better long-term fit.
DLR handling, throughput ceilings and when you can switch later are all covered here: https://smppcenter.com/learn/smpp-vs-http-api/