APN custom notification sound issue
No your sound key should have the sound file name you want to play.
{ aps = { alert = "message"; sound = "sound file name.extension"; badge = 1; };}eg: { aps = { alert = "message"; sound = "tone.caf"; }; }
I am using this and getting successful custom alert on my notification; keep sound duration as small as possible. I did with this file format: aiff, caf
if u want to test notification then u can try this app https://itunes.apple.com/us/app/easy-apns-provider-push-notification/id989622350?mt=12
I am not doing any marking of this app but it is good for testing push notification