[Freeswitch-users] FreeSwitch cant handle Pre-Paid ?

Hello, FreeSwitch gets freezed when i try to make it for Pre-Paid track. ex: while(session.ready()) { curl(....balance...); } I tried many possibilities but still i cant make this setTimeout() function working. How can i track when call is connected, seperate option to allow me tracking that call. Is it really not possible ? is it better to have other switch for this, because FreeSwitch cant allow developers to put there own javascript function while call is connected ? Should we use for this other switch ? ex: OpenSIPS or Kamilio. Please kindly guide, project is taking way too long only for this feature, dont found any wiki guide about this info. Thanks & Regards