Force DLR since SMSC is not returning DLR

Hello,

I'm trying to force a DLR back since my vendor is not returning a DLR. Is there 
an "easy way" to do this?

I have only the submit_sm_resp from the vendor, but I require to get the
deliver_sm PDU.

My scenario is opensmppbox -> bearerbox -> smsc

Thanks in advance!
-- 
Jose Figueroa