if sent with the standard connector, ACS is temporarily keeping the message id.Though this is in an internal table which is not accessible to workflowsAlso upon receiving the OK status via SMPP, the information will be removed from this tableSo you rather can't use it for the responseIncoming SMS schema - this schema is fixed and can't be extended. Also the fields filled via SMPP are fixed.You can create a custom schema but it won't be possible to link it via SMPPOne way might be to create a cus...