{
  "method": "REGISTER",
  "uri": "sip:example.com",
  "version": "2.0",
  "headers": {
    "to": {
      "uri": "sip:null-%00-null@example.com",
      "params": {}
    },
    "from": {
      "uri": "sip:null-%00-null@example.com",
      "params": {
        "tag": "839923423"
      }
    },
    "max-forwards": "70",
    "call-id": "escnull.39203ndfvkjdasfkq3w4otrq0adsfdfnavd",
    "cseq": {
      "seq": 14398234,
      "method": "REGISTER"
    },
    "via": [
      {
        "version": "2.0",
        "protocol": "UDP",
        "host": "host5.example.com",
        "params": {
          "branch": "z9hG4bKkdjuw"
        }
      }
    ],
    "contact": [
      {
        "uri": "sip:%00@host5.example.com",
        "params": {}
      },
      {
        "uri": "sip:%00%00@host5.example.com",
        "params": {}
      }
    ],
    "content-length": 0
  },
  "content": ""
}