In iOS, you can specify a sound that plays when your app presents a notification. You should follow Apple's limitations to do this via the Apple Push Notification Service.
The accepted audio formats are as follows:
- Linear PCM
- MA4 (IMA/ADPCM)
- μLaw
- aLaw
Audio files must be on the user’s device before the system can play them. Include the audio files in your app's bundle if you use a predefined set of notification sounds. For all other sounds, the remote notifications check only the following locations:
- The /Library/Sounds directory of the app’s container directory,
- The /Library/Sounds directory of one of the app’s shared group container directories,
- The main bundle of the current executable.
For example, add the audio file to your Application Bundle (placed at the top-level directory).
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Audio files cannot exceed 30 seconds. If you upload an audio file to the app bundle that is longer than 30 seconds, the iOS default audio sound will play on the device instead.
When you create an App Push campaign and want to use a specific notification sound, enter the file name, including its extension, in Edit campaign options > Notification Sounds.(1).png)