SessionDescription is NULL

[hthetiot]

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Versions affected

• Cordova version (e.g 7.1.0): 10
• Cordova iOS version (e.g 5.1.0): 6.1
• Plugin version (e.g 6.0.12): 6.0.19
• iOS version (e.g 10.2): 14.4.1
• Xcode version (e.g 11.1 - 11A1027): 12
• WebRTC-adapter version (e.g. 7.4.0): latest
• WebRTC Framework version (e.g. JSSip 3.1.2): easyrtc

Description

SetRemoteDescription result in SessionDescription is NULL even if sdp is valid.

Steps to reproduce

Expected results

Actual results

[hthetiot]

Fixed by using master that contains WebRTC M89.

[hthetiot]

Chrome 89 is deprecating Plan-B SDPs, and a result, it is adding the a=extmap-allow-mixed line in its SDPs by default. However, these SDPs are not interoperable with WebRTC versions 70 or lower. Because of this the above-mentioned mobile Participants fail to establish media connections with Chrome 89+ Participants.

The solution is to remove a=extmap-allow-mixed from Chrome 89+ SDPs. We are working to update our back end with this solution. In the meantime, you can temporarily work around this issue by passing offerExtmapAllowMixed: false in ConnectOptions in your JavaScript.

Source: https://githubmemory.com/@gjdownes

That why chrome 89 update broken iosRTC 6.x because it use WebRTC 69 while Iosrtc master is on M89 and will be released via 8.0.0

[hthetiot]

Related:

• https://bugs.chromium.org/p/chromium/issues/detail?id=908377
• https://groups.google.com/a/chromium.org/g/blink-dev/c/7z3uvp0-ZAc
• https://www.chromestatus.com/feature/6269234631933952

[hthetiot]

Related:

• https://github.com/bluejeans/sdk-webrtc-meetings/pull/26
• [P2P][Chrome 89][iOS 3.x][Android 5.x] Mobile Participants cannot see or hear Chrome Participants. twilio/twilio-video.js#1409

[hthetiot]

Fixed on 6.0.20 next release for 6 LTS

• b6cd033

[hthetiot]

Released as 6.0.20