Play sound in local notification

I have used Local Notification in my app an successfully generated an alert at correct time..

But when i tried following code for playing sound it does not play....

localNot.soundName =@"Ghulam Ali-Chamkte Chaad Ko.mp3";

Can anyone tell me the reason....Does the playing length of sound 开发者_Go百科file affects

---

According to the Apple Developer Documentation, you need to use "aiff", "caf" or "wav" files.

The link provided shows some ways of converting audio to these formats on your mac.