Lets say there are two receiver session from same application to a SMPP over different TCP ports. Message is sent to application and reply is (i.e deliver_sm_resp) is coming to SMPP via the other session Is this possible or reply should be come over the same SMPP session?
No, the deliver_sm_resp should be sent back using the same session as the deliver_sm was received on.
The response is linked with the request by a sequence number that is incremented with each request on the session so the it only makes sense within the same session.
来源：https://stackoverflow.com/questions/5909687/multiple-smpp-sessions