激活后，服务后台看到连接是WS，怎么变成wss

日志截取
CSeq: 4 REGISTER
I/flutter (18415): Contact: sip:n235547h@j1e17518m12n.invalid;transport=ws;+sip.ice;+sip.instance="urn:uuid:abf5b8a7-3e40-47ec-b7f4-bb439ab2ad5e";expires=60;reg-id=1
I/flutter (18415): Expires: 60
I/flutter (18415): Content-Length: 0