{
  "method": "OPTIONS",
  "uri": "sip:user@example.com",
  "version": "2.0",
  "headers": {
    "to": {
      "uri": "sip:user@example.com",
      "params": {}
    },
    "from": {
      "uri": "sip:caller@example.com",
      "params": {
        "tag": "323"
      }
    },
    "max-forwards": "70",
    "call-id": "transports.kijh4akdnaqjkwendsasfdj",
    "accept": "application/sdp",
    "cseq": {
      "seq": 60,
      "method": "OPTIONS"
    },
    "via": [
      {
        "version": "2.0",
        "protocol": "UDP",
        "host": "t1.example.com",
        "params": {
          "branch": "z9hG4bKkdjuw"
        }
      },
      {
        "version": "2.0",
        "protocol": "SCTP",
        "host": "t2.example.com",
        "params": {
          "branch": "z9hG4bKklasjdhf"
        }
      },
      {
        "version": "2.0",
        "protocol": "TLS",
        "host": "t3.example.com",
        "params": {
          "branch": "z9hG4bK2980unddj"
        }
      },
      {
        "version": "2.0",
        "protocol": "UNKNOWN",
        "host": "t4.example.com",
        "params": {
          "branch": "z9hG4bKasd0f3en"
        }
      },
      {
        "version": "2.0",
        "protocol": "TCP",
        "host": "t5.example.com",
        "params": {
          "branch": "z9hG4bK0a9idfnee"
        }
      }
    ],
    "content-length": 0
  },
  "content": ""
}