Bug 255995 – Incoming and outgoing audio do not recover for WebRTC call after PSTN call when User has an active PSTN call and only then User joins WebRTC call

• Component: WebRTC
• Status: RESOLVED DUPLICATE

[Madara Freimane]

Summary:
Incoming and outgoing audio do not recover for WebRTC call after PSTN call when User has an active PSTN call and only then User joins WebRTC call

Tested devices:
Bug is reproducible on:
- iPhone 14 Pro (iOS 16.3.1) and Safari
- iPhone 13 (iOS 16.4.1) and Safari
- iPhone 11 Pro Max (iOS 16.5 Beta) and Safari

Scenario:
Precondition:
Safari browser is killed
User has an active PSTN call

Steps:
1. User launches Safari browser and joins WebRTC call
2. User ends PSTN call and returns to WebRTC call
3. User tries to communicate with other Users using WebRTC call

Actual result:
No incoming and outgoing audio for iOS User in WebRTC call and it is not possible to get it back, incoming and outgoing video works as expected.

Expected result:
Audio recovers for WebRTC call after the PSTN call, if the first call is a PSTN call and only then User joins a WebRTC call.

Reproducibility:
100%

Sysdiagnostics file added (recorded on iOS 16.5 Beta at 17:03 EET, 19.04.23.):
https://drive.google.com/file/d/1C8wPkv_2nhY1vRGyw5HbFfgDeY4pLiRl/view?usp=share_link

[Radar WebKit Bug Importer]

<rdar://problem/108848218>

[youenn fablet]

Still reproducible in latest iOS.
Apparently, page is not muted when it tries to start capturing within a PSTN call.

[Madara Freimane]

Bug is still reproducible.
Tested devices and browsers:
- iPhone 11 Pro Max (iOS 17 Developer Beta 8, build: 21A5326a) and Safari
- iPhone 13 (iOS 17 Public Beta 6, build: 21A5326a) and Safari
- iPhone 11 (iOS 16.6) and Safari
- iPhone 8 Plus (iOS 16.5.1) and Google Chrome (V116.0.5845.14)

I am adding a new sysdiagnostics file (bug reproduced at 13:42 EET, 06.09.2023.):
https://drive.google.com/file/d/1Ay19mcVa7nbAUfBtBeRCLIXlTJZz035N/view?usp=sharing

[youenn fablet]

@Madara, this might be the same underlying cause as https://bugs.webkit.org/show_bug.cgi?id=259884.
Can you reproduce on latest iOS 17.2 beta?

*** This bug has been marked as a duplicate of bug 259884 ***

Bug is still reproducible.

Tested devices and browsers:
- iPhone 14 Plus (iOS 18.2 Beta 4 (22C5142a)) and Safari
- iPhone 13 Pro (iOS 17.7.2) and Safari

Bug is still reproducible.

Tested devices and browsers:
- Apple iPhone 12 (iOS 26.0) and Safari
- iPhone 11 Pro Max (iOS 18.7) and Safari

It does not seem to be a duplicate of this bug: https://bugs.webkit.org/show_bug.cgi?id=259884
 
Because in this case User has an active PSTN call and only then User joins WebRTC call but in the other bug ticket User receives PSTN call in the middle of the WebRTC call