{
  "SMS": {
    "allowCSFBInVolteMode": true
  },
  "ConferenceCalling": {
    "SerializeParticipants": true
  },
  "Signaling": {
    "EarlyMediaNeedsHeader": true,
    "AdditionalContactParams": {
      "REGISTER,INVITE,INVITE:*": "+g.3gpp.mid-call;+g.3gpp.srvcc-alerting;+g.3gpp.ps2cs-srvcc-orig-pre-alerting"
    },
    "UseIPSec": true,
    "SupportPEarlyMediaHeader": true
  }
}