电网企标B接口接入记录（一）：注册

    REGISTER sip:010090000000000000@111.203.3.78:21112 SIP/2.0
    Via: SIP/2.0/UDP 100.106.180.41:15060;rport;branch=x5hG8bK235
    From: <sip:010090016701000000@01009000>;tag=3723455366
    To: <sip:010090016701000000@01009000>
    Call-ID: 1082198914
    CSeq: 2 REGISTER
    Contact: <sip:010090016701000000@100.106.180.41:15060>
    Max-Forwards: 70
    User-Agent: SIP UAC V1.0.0.0
    Expires: 3600
    Content-Length: 0

    SIP/2.0 401 Unauthorized
    Via: SIP/2.0/UDP 100.106.180.41:15060;rport=11999;branch=z9hG4bK215;received=117.70.170.180
    From: <sip:010090016701000000@01009000>;tag=3723455366
    To: <sip:010090016701000000@01009000>;tag=3Qx6zbFy
    Call-ID: 1082198914
    CSeq: 2 REGISTER
    WWW-Authenticate: Digest realm="11.146.1.4",nonce="9bd055",algorithm="MD5"
    Content-Length: 0
    Contact: <sip:010090000000000000@11.146.1.4:21112>
    User-Agent: GoSIP

    REGISTER sip:010090000000000000@111.203.3.78:21112 SIP/2.0
    Via: SIP/2.0/UDP 100.106.180.41:11999;rport;branch=Rf1s3fEyX5rSa4OY
    From: <sip:010090016701000000@01009000>;tag=3723455366
    To: <sip:010090016701000000@01009000>
    Call-ID: 1082198914
    CSeq: 4 REGISTER
    Contact: <sip:010090016701000000@117.70.170.180:11999>
    Authorization: Digest username="010090016701000000", realm="11.146.1.4", nonce="9bd055", uri="sip:010090000000000000@117.70.170.180:11999", response="2fc3d346a8cce4323c9380184f6bcf39", algorithm="MD5"
    Max-Forwards: 70
    User-Agent: SIP UAC V1.0.0.0
    Expires: 3600
    Content-Length: 0

    SIP/2.0 200 OK
    Via: SIP/2.0/UDP 100.106.180.41:11999;rport=11999;branch=Rf1s3fEyX5rSa4OY;received=117.70.170.180
    From: <sip:010090016701000000@01009000>;tag=3723455366
    To: <sip:010090016701000000@01009000>;tag=F61C71Ka
    Call-ID: 1082198914
    CSeq: 4 REGISTER
    Contact: <sip:010090000000000000@11.146.1.4:21112>;expires=60
    Date: 2022-04-20T23:29:42.951
    Content-Length: 0
    User-Agent: GoSIP