Xcenter v19 Broadcaster No response returned Message.

Hello all.  we set up a custom end point which is IIS web service but unsure what soap response the broadcaster is expecting back when we receive the payload.  As a result we are getting the information but we have dups because it keeps resending.  In the trn_poslog_work_item table it states "No response returned.".  Any guidance here or soap response examples would be helpful.