注册直接贴个流程图吧，这里跟GB28181一致的。图片参考信令：步骤1 REGISTER sip:010090000000000000@111.203.3.78:21112 SIP/2.0 Via: SIP/2.0/UDP 100.106.180.41:15060;rport;branch=x5hG8bK2......