dlr-url and dlr-mask

[Willy Mularto]

Guys I have read about dlr-url and dlr-mask on the user guide, what I don't 
understand is on dlr-url said that a  URL to be fetched if a dlr-mask CGI 
parameter is present. and dlr-mask is  Optional. Request for delivery 
reports with the state of the sent message. The value is a bit mask composed 
of: 1: Delivered to phone, 2: Non-Delivered to Phone, 4: Queued on SMSC, 8: 
Delivered to SMSC, 16: Non-Delivered to SMSC. Must set dlr-url on 
sendsms-user group or use the dlr-url CGI variable.

I have set dlr-url under sendsms-user group to http://192.168.1.68/, how to 
activated the dlr-mask with http://192.168.1.68:1234/cgi-bin/sendsms ? and 
view the dlr status? Thank you for any reply.

Regards
Willy