audiosession category was wrongly updated from playandrecord to playback, which cause no audio on Audiosession by counting down alarm.

Hi All,

I am working on VoIP application, when a call receive, my app will activate audio session with playandrecord.

However, the issue is during a call, if there Alarm triggered, like set Clock Timer count down for 5 seconds,

when 5 seconds clock Alarm triggered, my app will receive Category update event, and switch my audio session from playandrecord to playback. the alarm does not send interrupt notification.

    AVAudioSessionRouteChangePreviousRouteKey = "<AVAudioSessionRouteDescription: 0x282bd5e60, \ninputs = (\n    \"<AVAudioSessionPortDescription: 0x282bd66d0, type = MicrophoneBuiltIn; name = iPhone Microphone; UID = Built-In Microphone; selectedDataSource = (null)>\"\n); \noutputs = (\n    \"<AVAudioSessionPortDescription: 0x282bd63f0, type = Receiver; name = Receiver; UID = Built-In Receiver; selectedDataSource = (null)>\"\n)>";
    AVAudioSessionRouteChangeReasonKey = 3;
}}

What is best to check such event to reactive audio session with correct category.

if I do it on cellular call, once the Alarm is triggered, it will play vibration, there is tone at all.