dlr mask values and SMPP

Hi All,

When I set the dlr-mask to 31 the response I get (%d - report value) is
12 (Message Buffered + Message Delivered to SMSC). If I set the dlr-mask
to 1 I get the same result. Still no 'Delivery Sucess'. 

Using the Submit_sm/Deliver_sm can we find out if the message actually
delivered to the handset (not just SMSC) or do we need to use query_sm
(message_id) to get this.

Cheers,
Alan