No voice in Xlite

i have installed Asterisk on a Linux 9.2, and i use now Xlite to call him self from an Windows XP station (in Network Linux - Windows), it is now running well (i get the call and i take him), but i cann’t hear anything, the Xlite is installed on the Win XP, and i get a notice : res_musiconhold.c:511 monmp3thread: Request to schedule in the past.
but my problem is that i cann’t hear anything(the connection is established well)

given the lack of info you’ve posted, the only thing i’ll suggest is looking at your time settings. Asterisk is very sensitive to time inconsistencies, so make sure your server and workstation are reporting the same time.