Wholesale glossary
SMPP (Short Message Peer-to-Peer) is the TCP protocol used to exchange SMS between applications, aggregators and operator message centres. Nearly every commercial message on the planet, OTPs included, travels over SMPP somewhere in its journey. Alternatives exist (HTTP APIs, SS7 delivery), but SMPP remains the wholesale backbone of messaging.
Why it matters
For buyers, SMPP specifics matter for throughput (window size, binds), latency and DLR (delivery receipt) integrity. Fake or manipulated DLRs are their own fraud category: the sender is told the message was delivered when the grey route discarded it.
What practitioners watch
Ask suppliers about bind limits, DLR provenance (real versus synthesised receipts) and error code transparency. The SMS Monetization playbook at iBasis grew from exactly these questions.
Related: SMS Wholesale · A2P vs P2P · SMS Firewall