CDRs For CallBack

Hello, I need call detail records, the records that freepbx uses does not tie both leg or identify the first leg to the second leg. A2billing is able to do so but I am experiencing problems using A2BILLING. When I make calls thru A2billing, using callback, my destination does not see my dtmf digits When I make the same call thru freepbx my destination does see my dtmf digits. Please note the same carrier has been used for both tests. I tried all different types of dtmf modes on A2billing. The only mode that works on Freepbx is dtmf=inband g711& alaw both codecs must be in the trunk. Options: 1. Investigate why does A2billing not send the DTMF as Freepbx does 2. If option 1 does not work then provide cdrs like A2billing does or close to it so I can provide my customer with cdrs. please feel free to list all questions. I will provide access into the box upon awarding the project if you have freepbx and A2billing servers I can provide you with my carrier details.