[Serusers] Record Routing

I am using SER 0.9.6 along with MS RTC Client API for the client application. When I used the line: if(method!=REGISTER){ record_route(); } It caused in a one way communication only in case of audio as well as in case of in case of instant messaging, a new communication session had to be established for each message. But when i removed the record_route() and used sth like: if(method==ACK){ t_relay(); } When my code included both the above code snippets, it never reached the later: if (method==ACK)... part. Can anyone please tell me why when record_route() was switched on, the control never reached the later part. Thank you kumar