[asterisk-users] Cant Play gsm file

[atik]

Hi,

i am having problem on playing asterisk sound file on my new installed
asterisk..
i have the following extension , if i call from any SIP / IAX  phone
playback or voicemail doesnt play anything .... but when i dial 102, I
hear the MP3 music ..

exten => 99,1,Answer()
exten => 99,2,Playback(prepaid-welcome)
exten => 99,3,Hangup()

exten => 101,1,VoiceMailMain()

exten => 102,1,Answer()
exten => 102,2,MusicOnHold(default)

I have format_gsm.so, codec_gsm.so loaded and i am using
asterisk-sounds-1.2.1  , asterisk-1.2.23 on debian 4.0.

do i miss any audio library?

thanks
atik