Mozilla Firefox 63+ fix for SDP format
Photo Source: Mozilla Foundation
Avoiding the Datachannel breaking in Firefox 63+
Nowadays, it is common for web browsers to make updates and changes to their implementations. This is even more common when we talk about modern technologies like WebRTC. A new web browser update that confirms this theory is the last change on Firefox 63 when negotiating the Datachannel.
If you are negotiating a Datachannel with a Firefox version lower than 63, the Session Description Protocol (SDP) will looks something like this:
m=application 9 DTLS/SCTP 5000
a=sctpmap:5000 webrtc-datachannel 1024
However, this same negotiation in a Firefox63+ browser is different:
m=application 9 UDP/DTLS/SCTP webrtc-datachannel
a=sctp-port:5000
As you can see, the problem is that the new format is incompatible with the previous one. The old parser expected to find a number (5000) where the new parser expects a text (webrtc-datachannel).
To fix it, we have added the new SDP format to our Video Gateway (WebRTC). This new 3.3.1 release includes a new parser will be able to handle the offers of Firefox 63+.
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