Support for integrating RRLP with openbsc

Hello everyone I am new to openbsc, and trying to implement my own mobile network for my masters project. Till now everything has gone well and my network is working gud. But the issue is when I am trying to implement rrlp with openbsc. I have set the rrlp mode to ms-based, but there is no response from the phone on sending the request. I have checked that the request is going to the phone with the help of wireshark. So please anyone help me with this, that should i use E-OTD or ms-assisted method for getting the response from the phone. Thanking you in anticipation Kunal