5 digit error codes

Hi,

In the deliver_sm you get back the network_error_code if the SMS was not
delivered. I've been told by an SMSC service provider that they will give
back 5 digit error codes in certain cases and we need to setup our system to
receive them. From Kannel the error codes are always in a 3 digit form i.e.
001 or 000.

Will Kannel give back 5 digit error codes should the SMSC send them back?
and besides requesting the dlr when sending the SMS, is there any other
configuration or patch required to receive 5 digit error codes?

Rgds