{
  "Voice": {
    "EnableVolteByDefault": true
  },
  "Signaling": {
    "AdditionalContactParams": {
      "REGISTER,INVITE,INVITE:*": "+g.3gpp.mid-call;+g.3gpp.srvcc-alerting;+g.3gpp.ps2cs-srvcc-orig-pre-alerting"
    },
    "AdditionalHeaders": {
      "INVITE,INVITE:*": "Feature-Caps: *;+g.3gpp.srvcc-alerting"
    },
    "UseIPSec": true,
    "IncomingCallEndReasons": {
      "TemporarilyUnavailable": {
        "StatusCode": 480,
        "TerminationEvent": "RemoteHangup"
      }
    }
  }
}