SMPP Version

The SMPP version to be used between the SMPP Server and client is specified by the client when first binding to the server.

SMS Central SMPP Server supports SMPP version 3.4.

The key differences between SMPP versions 3.3 and 3.4 are:

• SMPP version 3.4 supports an additional "transceiver" bind mode. With this mode, SMPP requests can be transmitted and received over the same SMPP session.
•  SMPP version 3.3 supports only numeric message_id values for uniquely identifying SMS messages. SMPP version 3.4 also supports longer alpha-numeric message_id values.
• SMPP version 3.4 supports optional SMPP parameters (also known as TLVs). The SMS Central SMPP Servers use optional SMPP parameters in delivery receipts for message state identification.