Like your other post this is insufficient information for a diagnosis. Please give us more details. Pastebin a console log including a SIP trace. See this page for further instructions:
http://wiki.freeswitch.org/wiki/Reporting_Bugs

-MC

On Fri, May 28, 2010 at 11:41 PM, babak yakhchali <babak.freeswitch@gmail.com> wrote:
Hi
using session.streamfile() , caller hears the playback from the sec 5 or 6 not from the start. it seems the file was playing but the media is not sent to caller till sec 5 6

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