How to get audio session when connecting voip call on ios

[onedoc-kjh]

Is your feature request related to a problem? Please describe.
We are experiencing delayed audio session activation when initializing the agoraEngine for 1:1 calls after receiving a VoIP call through flutter_callkit_incoming.

When reviewing iOS logs, we found that there's a conflict where our app attempts to start an audio session while the phone app's session is still active:

MXSessionBeginInterruptionFailureLog_SessionCurrentlyActive: Optional(com.apple.TelephonyUtilities) MXSessionBeginInterruptionFailureLog_SessionTryingToGoActive: Optional("appName")

clientName=sid:0x69007, callservicesd(150), 'prim', displayID=com.apple.TelephonyUtilities, category=Ringtone, mode=Default, clientPriority=PhoneCall

clientName=sid:0x6913b, Runner(2822), 'prim', displayID="appName", category=PlayAndRecord_WithBluetooth_DefaultToSpeaker, mode=VoiceChat, clientPriority=Default

hiennguyen92/flutter_callkit_incoming#402 (comment)

Similar to the solution proposed in this comment [link], is there a way to acquire the audio session in our case? We're looking for a way to properly handle the audio session transition from the system phone app to our VoIP call.

[flutter_callkit_incoming]
https://pub.dev/packages/flutter_callkit_incoming