viptelekom

Hello, I have a problem with ringtone for extension. I just uploaded a wav file in the right format ( 1min 30s long ), and if i call my extension then as ringtone i can hear only the wav file's first 15 seconds repeating, and not the full length. Does anyone know how to extend custom ringtone's play time? I tried to call from inside extension and also from outside trunk, but i have the same problem from both directions. Any solution is welcome. Thank you in advance, Gergo