The iOS13.6 system cannot establish a connection. It has been tested to be a problem with Google's ice servers. Switching to other free ice server resources can be used.

[kevenleung]

fileprivate let defaultIceServers = [ "stun:stun01.sipphone.com", "stun:stun.ekiga.net", "stun:stun.fwdnet.net", "stun:stun.ideasip.com", "stun:stun.iptel.org", "stun:stun.rixtelecom.se", "stun:stun.schlund.de", "stun:stunserver.org", "stun:stun.softjoys.com", "stun:stun.voiparound.com", "stun:stun.voipbuster.com", "stun:stun.voipstunt.com", "stun:stun.voxgratia.org", "stun:stun.xten.com"]

[a83988029]

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