WebRTC call button do nothing

You said you disabled the pjsip channel driver, but it is required for webrtc. See this post:

It is about Zulu but he says that WebRTC requires the same.

If you do not want pjsip to listen for SIP, it looks like according to that thread, you could enable pjsip for WS and WSS only, which should satisfy the webrtc requirement.