`setLocalDescription` is where all the logic happens! `createOffer`/`createAnswer` just creates an easy config to pass.
You can change lots of undocumented stuff in the SDP! This list isn't exhaustive, but I have seen production apps do these.
* Change ice ufrag/upwd
* Enable simulcast
* Change code preferences
* Change codec specific behavior (Opus ptime)
My guess is that it works this way so browser vendors don't have to actually standardize behavior. They don't need to go through the W3C every time they want add something new. ORTC was released to try and fix this though. `SDP Munging` is a terrible idea and has caused me so many headaches :/
You can change lots of undocumented stuff in the SDP! This list isn't exhaustive, but I have seen production apps do these.
* Change ice ufrag/upwd
* Enable simulcast
* Change code preferences
* Change codec specific behavior (Opus ptime)
My guess is that it works this way so browser vendors don't have to actually standardize behavior. They don't need to go through the W3C every time they want add something new. ORTC was released to try and fix this though. `SDP Munging` is a terrible idea and has caused me so many headaches :/