This adds the possibility to configure the SIP Via header to plain WS to allow reverse proxying from WSS to WS, internally, to work around a bug in freeswitch where the WSS stack would get deadlocked due to a still unidentified bug in there that has to do with SSL termination
Current sessionDescriptionHandlerModifiers of SIP.js acts before ICE gathering is done. This means we are not able to modify/strip candidates in local SDP.
This modifier acts on local SDP, by allowing user to modify SDP before it is sent on INVITE message.
This considerably changes the way we process audio signaling and start audio elements in user's browser.
We now avoid using AudioContext element for both microphone and listenonly calls, once it is unstable for some iOS devices (cracky audio, user stops hearing audio after a while).
Increased default value for listenOnlyCallTimeout: this avoids activating FreeSWITCH's fallback when ICE negotiation takes longer than 15sec (tested on DO).
Increased listenonly logs.
This fixes#8133#10388
one of the most annoying things about breakout rooms is that the users have to do the echo test again. So they have to wait 7 to 12 seconds again (for most typical bbb configurations) just for the echo test to connect. This change reduces the iceCheckingTimeout from 5 seconds to 1 second, which is still way more than enough unless there is a configuration or network load issue. Depending on network of the used client, this change saves the user between 4 to 8 seconds for every time they activate audio playback or microphone.
The original 5 seconds timeout is not part of the official sip.js library but instead was added in #2877
