I have found that the playback of a file can be delayed to the point that the callee will either hangup (thinking it MUST be over now since it has been quiet for 7-8 seconds) or a Voicemail's silence detection will trigger even though I hadn't finished playing back all of the audio files I had intended to play. Ideas: Does session.stream block (spidermonkey script)? Since I am doing several simultaneous calls if session.stream blocked file access that could account for it (although that would be a terrible calamity if true). Does anybody else have ideas? I have been using pcapsipdump to "record" the calls and I can confirm that the reports are true - in some cases the playback of the next audio file can delay for a long time. I have tested these calls to my mobile phone and office phone without any delays present, but it seems to happen to some people some of the time. Thanks, Jason