{
 "version": "1.0",
 "routing": "serial",
 "routes":
  [
   {
     "uri": "sip:127.0.0.1:5080",
     "dst_uri": "sip:127.0.0.1:5082",
     "path": "<sip:127.0.0.1:5084>, <sip:127.0.0.1:5086>",
     "socket": "udp:127.0.0.1:5060",
     "headers": {
       "from": {
         "display": "Alice",
         "uri": "sip:alice@wonderland.com"
       },
       "to": {
         "display": "Bob",
         "uri": "sip:bob@wonderland.com"
       },
       "extra": "X-Hdr-A: abc\r\nX-Hdr-B: bcd\r\n"
     },
     "branch_flags": 8,
     "fr_timer": 5000,
     "fr_inv_timer": 30000
   },
...
  ]
}