iOS Problem in playing audio

[iphonejudy]

I used the below code for play and pause audio

-(void) play
{
AudioServicesPlaySystemSound(clappingFileID);
}

//It will be called when pause button click
-(void) pause
{ 
AudioServicesDisposeSystemSoundID (clappingFileID);
}

I want to pause the audio when its playing.
My problem is the pause method is called after playing the full audio.Even though i pressed the pause button while the audio is playing.