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Re:Show HN: Open source music player in beta by halflings on Sunday December 04, 2016 @12:19PM (#13100702)
No permission seems to be required to listen on a call being done:

https://developer.android.com/reference/android/telephony/Ph...

There's one permission (READ_PHONE_STATE) required for some other methods, but it is different from the permission to initiate a a phone call.

Re:Show HN: Open source music player in beta by bcook on Sunday December 04, 2016 @12:54PM (#13100877)
READ_PHONE_STATE is precisely what the app in question uses.

https://github.com/harjot-oberai/MusicStreamer/blob/master/a...