happens 'icecandidate' never call with event.candidate=false

[barmoleg]

function createSucceeded(desc) {
var listener;
connection.addEventListener('icecandidate', listener = function(event) {
var candidate = event.candidate;
if (! candidate) { //-- Never happens

may be use promise?

[svarunan]

event.candidate will not be false, last event's candidate will be undefined when ice gathering is completed.
I feel you might also be seeing issues like in #432

[ibc]

@barmoleg as you may check, JsSIP does not remove/mangle listeners given to the underlying peerconnection:

https://github.com/versatica/JsSIP/blob/master/lib/RTCSession.js#L1544

JsSIP uses adapter.js, but AFAIS such a library neither:

https://github.com/webrtc/adapter/blob/master/src/js/chrome/chrome_shim.js

So, if candidate is never falsy/undefined/null, that's out of the scope of JsSIP and it's just a pure native RTCPeerConnection subject.