If by "failed on kamailiio restart", you mean than the WebRTC conection get closes, that's normal ... It's a TCP conection, that when you restart Kamailio, will be closed.

From: "Johnny Ritzer" <sudoritz@gmail.com>
To: "Kamailio" <sr-users@lists.kamailio.org>
Sent: Tuesday, August 11, 2020 6:57:44 AM
Subject: [SR-Users] Example config for webRTC-SIP kamailio.cfg for sip.js

Anyone know where to grab an example config for getting web socket-sip working.

I tried this one but its failing on kamailio restart it might be some very small thing.

https://github.com/havfo/WEBRTC-to-SIP/blob/master/etc/kamailio/kamailio.cfg

wss://sip.kamailio-box.com:8080

Client = sip.js (webrtc)

SIP server = (mitel) PBX (straight sip)

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