SMS to SMPP
Along SMS-to-Applications you can also use SMS to SMPP to have inbound SMS messages forwarded to an application via SMPP. Please contact Retarus Support to configure the required action for you. Once created, you can use the action and activate the use of inbound SMPP for a specific keyword as described in Creating a keyword.
The action created for you is visible in EAS under Administration - SMS Services - SMS Inbound Services in the Actions tab. You can see an example with the action configured for SMS to SMPP in the image below.