SMPP Sessions

Session Establishment

To initiate communication, an ESME must establish a session with the SMSC using a binding process. This process involves authentication and authorization to ensure that only legitimate ESMEs can connect to the SMSC. The ESME uses a bind request along with its system_id (username) and password to authenticate.
As we already know SMPP defines three types of binding modes for establishing sessions.
When a bind request is sent, the SMSC responds with a bind response to confirm whether the authentication was successful. Upon successful binding, a session is established, allowing the ESME to exchange PDUs with the SMSC.

SMPP Session States

An SMPP session can exist in one of the following states: