[Webkit-unassigned] [Bug 256593] New: [MacOS] All Users can hear each other if MacOS User accepts an incoming PSTN call that is received on iPhone while MacOS User is in WebRTC call

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256593

            Bug ID: 256593
           Summary: [MacOS] All Users can hear each other if MacOS User
                    accepts an incoming PSTN call that is received on
                    iPhone while MacOS User is in WebRTC call
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: madara.freimane at testdevlab.com
                CC: youennf at gmail.com

Summary:
[MacOS] All Users can hear each other if MacOS User accepts an incoming PSTN call that is received on iPhone while MacOS User is in WebRTC call

Tested devices:
A bug is reproducible on:
- MacBook Pro (Intel, 2020, MacOS 13.3.1 (a)) with Safari (V16.4) AND iPhone 13 (iOS 16.4.1(a))
- MacBook Pro (M1, 2020, MacOS 13.3.1 (a)) with Safari (V16.4) AND iPhone 14 Pro Max (iOS 16.4.1(a))

Use case:
Precondition:
iPhone and MacBook devices are under the same iCloud account (to be able to get "iPhone microphone" as a microphone device under the settings in WebRTC call)
The MacOS User is in an active audio call

Steps:
1. Another User makes a PSTN call to iPhone User
2. MacOS accepts the incoming PSTN call that is received on MacOS because MacBook is connected to iPhone (same iCloud account is used)

Actual result:
All Users can hear each other if MacOS User accepts an incoming PSTN call that is received on iPhone while MacOS User is in a WebRTC call (The user who made a call to iPhone User can hear audio that comes from the WebRTC call, and the Users who are in the WebRTC call can hear audio between Users who are in the PSTN call)

Expected result:
Audio is available only from one active call:
- when the PSTN call is active and accepted by MacOS User, the WebRTC call is muted and Users are not able to hear each other

Reproducibility:
100%

Additional information:
- Sysdiagnostics file added from MacBook device (bug reproduced at 19:37 pm, 10.05.2023., EET):
https://drive.google.com/file/d/1nnlgLr4Pd5VluF8xhPiigdclnCF2-2Dc/view?usp=sharing

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