28181平台对接接口详解1 信令接口1.1 平台注册下级平台主动向上级平台注册;注册鉴权信息(用户名和密码)由上级提供;举例说明:下级-—-〉上级REGISTER sip:62025000002000000001@10.130。140。82:7100 SIP/2.0Call—ID: c82dee890ea56d9d332fe4a5dbd2772c@10。129.4。21CSeq: 1 REGISTERFrom: 〈sip:62025202502000000001@10。129.4。21:5080>;tag=5923_661_2647061To: Max—Forwards: 70Contact: 〈sip:62025202502000000001@10。129。4。21:5080〉Via: SIP/2。0/UDP 10.129。4。21:5080;branch=z9hG4bK2647061_661_19459966820285136301Authorization: Digest username="admin”,realm="1234",nonce="7104983f5477dd30a65167b28553df65”,uri=”sip:62025000002000000001@10.130.140.82:7100",response="ceb3a346523335fb0c6d66d24a7e77b5”,algorithm=MD5,opaque="f10efb1af3e8a362bcda7465284073ce"Expires: 3600Content-Length: 0上级-——〉下级SIP/2.0 200 OKVia: SIP/2。0/UDP 10.129。4.21:5080;branch=z9hG4bK2647061_661_19459966820285136301...