PLATFORM AND VERSION iOS Development environment: Xcode 15.0, macOS 14.4.1, Objective-C Run-time configuration: iOS 17.2.1, DESCRIPTION OF PROBLEM I am developing an application that uses NetworkExtension (VoIP local push function). But iOS sometimes doesn't call didActivateAudioSession after following sequence. Would you tell me why iOS doesn't call didActivateAudioSession ? (I said "sometimes", but once it occurs, it will occur repeatedly) myApp --- CXStartCallAction --->iOS myApp <-- performStartCallAction callback --- iOS myApp --- AVAudioSession setCategory: AVAudioSessionCategoryPlayAndRecord --->iOS myApp --- AVAudioSession setMode: AVAudioSessionModeVoiceChat --->iOS myApp <-- didActivateAudioSession callback ----iOS I suspect that myApp cannot acquire an AVAudioSession if another app is already using AVAudioSession. [QUESTION1] Is my guess correct? Should I consider another cause? [QUESTION2] If my guess is correct, how can I prove if another app is already using an AVAudioSession? This issue is based on a customer complaint, but the customer said they don't use any other apps. Best Regards,

PLATFORM AND VERSION iOS Development environment: Xcode 15.0, macOS 14.4.1, Objective-C Run-time configuration: iOS 17.2.1, DESCRIPTION OF PROBLEM What is the general approach to analyzing cpu_resource_fatal.ips? Is there a standard way to analyze it? (Instruments are not available in this analysis, because this is only occurs on the customer's iPhone.) Also, can this file be symbolicate? Attachment file is a sample ips file. FjSoftPhone.cpu_resource_fatal-2024-06-21-150321.ips