[Webkit-unassigned] [Bug 204625] New: iPhone X GSM, XS/XS Max in Safari using webRTC is transmitting clicking sound

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204625

            Bug ID: 204625
           Summary: iPhone X GSM, XS/XS Max in Safari using webRTC is
                    transmitting clicking sound
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aman.khangura at kp.org
                CC: youennf at gmail.com

iPhone X GSM, XS/XS Max in Safari.

FINDINGS
The issue is isolated to the iPhone X GSM, iPhone XS/XS Max in Safari.  We validated this through reported user issues as well as our testing.  We were unable to recreate the issue with iPhone 6, 7, or 8.  We cannot eliminate the iPhone 11 as we do not have one to test with nor have we seen any reported issues from users with an iPhone 11.  We will watch to see if any reports come in.
Adding a headset eliminated the clicking on the call for all users except the user on the iPhone XS.  I could still hear the clicking, but because I was on a headset that clicking was not rebroadcast to the meeting.
Muting the iPhone XS eliminated the clicking in the meeting, but not to the audio heard by the iPhone XS user. 
We also recreated the issue where the volume is turned all the way up but the sound is too quiet to hear.  We have received multiple reports of this issue from users.  I was able to restore normal sound by muting and unmuting.  This reset the volume and restored it to full volume.  Again this is isolated to iPhone X GSM, XS/XS Max in Safari.  No reports have come in from other model iPhones.
We were able to recreate the issues in the Pexip Native Web App.  This isolates the issue outside of the IVVR Application, but does not indicate exact root cause.

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