I recently upgraded from FS 12790M to svn 17188. When I did, I noticed that session.streamFile behaved differently and I started having problems with my IVR app. With the upgraded FS, I have a problem with streamFile no firing on the DTMF and calling the callback function for the first few seconds of the wav file playback. It behaves as though it does not hear the DTMFs. If I wait for 2 seconds or so of the wav file and then DTMF, streamFile catches the DTMF and all is well. If I key as soon as I hear the wav file start, streamFile just keeps playing the wav and does not call the callback function. When I revert back to the previous version of FS, streamFile always fires the callback right away no matter how quickly I press the first DTMF as the wav file starts to stream out. The wave file is RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz The snippet of js code I am using is as follows. if(session.ready()) { session.answer(); session.sleep(750); while(session.ready()) { session.sleep(500); session.flushDigits(); // clear out input buffers if((pin=session.streamFile(snd_prefix+"/enter-acct-numbers.wav",onlyDigi ts_cb,""))===false) { pin=session.getDigits(pinmax,pinterm,pinwait); } else { pin+=session.getDigits(pinmax-1,pinterm,pinwait); } // more code here.. } Do I need to change the way I use streamFile in the later release?