Opensips.cfg configuration for sip message from asterisk to opensips smpp to smsc and dlr report back from smsc to asterisk

I need help to configure opensips.cfg. I want to send sip message send from mobile Zoiper to asterisk>> opensips>> smsc and after that Delivery report from smsc to opensips then to asterisk
Now i can send sip message from mobile zoiper to asterisk, then to opensips to smsc but delivery report from smsc to opensips not forward to asterisk properly