[Webkit-unassigned] [Bug 246331] New: [iPhone 14] User cannot unmute WebRTC call and loses incoming and outgoing audio after receiving PSTN call and declining it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246331

            Bug ID: 246331
           Summary: [iPhone 14] User cannot unmute WebRTC call and loses
                    incoming and outgoing audio after receiving PSTN call
                    and declining it
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: madara.freimane at testdevlab.com
                CC: youennf at gmail.com

Summary:
[iPhone 14] User cannot unmute WebRTC call and loses incoming and outgoing audio after receiving PSTN call and declining it

Tested devices and browser:
Bug is reproducible on:
- iPhone 14 (16.02, build: 20A380) with Safari
iPhone 14 (16.0.3, build: 20A392) with Safari

Bug is not reprodudicible on:
- iPhone 11 (16.02, build: 20A380) with Safari
- iPhone 11 (16.03, build: 20A392) with Safari

Use case:
Preconditions:
Users (also iPhone 14 User) are in active audio/video WebRTC call 

Steps:
1. iPhone 14 User receives a PSTN call
2. iPhone 14 User declines the PSTN call
3. iPhone 14 User tries to unmute the WebRTC call

Actual result:
Incoming and outgoing audio disappears and iPhone 14 User cannot unmute WebRTC call (unmute button not responding)

Expected result:
WebRTC call goes to "unmuted" state automatically after the PSTN call. Remote participants in the WebRTC call can hear iPhone 14 User again.

Reproducibility:
100%

Additional information:
-Sysdiagnostics file added:
 https://drive.google.com/file/d/181R5Tou-8x4Qryb8tQW4l2-W-kniRrTW/view?usp=sharing

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