Hi, I'm writing a python application that would loop a call using PJSIP. So basically the application will register two accounts, one's the caller and the other is the callee. I would like to do the following: - Make call from caller to callee -- done - Tx SIP100 from callee -- done - Tx SIP180/183 from callee after 3 seconds - Answer call by callee after 5 seconds I'm able to generate the SIP180/183 and SIP200 responses successfully, but I'm unable to set timers the way I've mentioned above. I tried python's time.sleep() function, and I've also gone to the length of checking the call's getInfo().totalDuration.sec before sending the SIP180/183 and SIP200 responses, but they didn't work as I would have expected. Both approaches produce the same result, which is a delay in responding with SIP100. In other words, the calling account never receives the SIP100 until the timer passes. It's worth nothing that both accounts are calling each other through a SIP proxy (SBC). Also, as I'm using Python, I've set mainThreadOnly to True, and threadCnt to 0. Appreciate your help on this. Thanks //M