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After Googleing and looking through StackOverflow, I haven't found a suitable solution to "inject audio from an iPhone app into an ongoing phone conversation."

As an iPhone app dev newbie, I found Intercepting phone call - iPhone (correct method to hook in CoreTelephony), but I don't want to do ant jailbreaking. I want my iPhone app to insert pre-recorded phrases and noise effects into an ongoing phone conversation.

Can anyone tell me where I would start with that? Any hints, links or just some "general direction" advice would be much appreciated.

Paulw11
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Shawn Spencer
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    I highly doubt this is supported by any official Apple API. – tadman May 07 '18 at 20:47
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    Yeah, this won't be possible. Apple has made clear and definitive choices to wall off stuff like phone calls from third-party apps. There are simply too many ways this would be used maliciously. – ceejayoz May 07 '18 at 21:15
  • OK, that's very interesting to me. Thanks for your responses. So apps like Tape-A-Call are OK, because they don't actually interfere with the phone conversation? Good to know. – Shawn Spencer May 11 '18 at 15:59

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The iOS security sandbox actively prevents any (non-Apple) app from injecting audio into another app, such as the Phone app, where inter-app audio is not explicitly supported.

hotpaw2
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