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I'm sure you have already found a solution, but I wanted to add a solution for anybody else looking at this question. You will need to covert the file to a wav file and then play it. There are some libraries out there to make this a bit easier. Check out https://github.com/arkasas/OggDecoder. It supports Swift Package Manager. import OggDecoder let decoder = OGGDecoder() let oggFile = oggFileURL() decoder.decode(oggFile) { (savedWavUrl: URL?) in // Do whatever you want with URL // If convert was fail, returned url is nil }

Just wanted to share what I discovered today with my testing. You will need to create a new APNs cert if you haven't done that lately and are using cert based push notifications. They have updated the text to read: Apple Push Notification service SSL (Sandbox & Production) Establish connectivity between your notification server, the Apple Push Notification service sandbox, and production environments to deliver remote notifications to your app. When utilizing HTTP/2, the same certificate can be used to deliver app notifications, update ClockKit complication data, and alert background VoIP apps of incoming activity. A separate certificate is required for each app you distribute. After I updated my cert, I was able to get the incoming push notification to properly deliver to: func incomingPushResult(channelManager: PTChannelManager, channelUUID: UUID, pushPayload: [String : Any]) -> PTPushResult I was using a simple script that calls curl like this: curl -v \ -d '{"activeSpeaker":"Bart"}' \ -H "apns-push-type: pushtotalk" \ -H "apns-topic: <insert your bundle id here>.voip-ptt" \ -H "apns-priority: 10" \ -H "apns-expiration: 0" \ --http2 \ --cert key.pem \ https://api.sandbox.push.apple.com/3/device/8f12332d93d45d39d407368175e07b76d2494d0d67439289b3a50c7bd6f8f206 Also, I noticed that PTChannelTransmitRequestSource is always of type .unknown when the system UI is used to transmit. I would love to have some sample code too. I'm still working on hooking up the portions of my app that would record/playback the audio.