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This event indicates that a call transfer attempt using the Refer method resulted in an error or failure.

The Refer method involves passing the responsibility for handling the call to another destination while maintaining the media path.

However, in this case, the transfer failed due to the destination being unavailable or rejecting the transfer request.


  "payload": {
    "call_sid": "fead969f-77d0-45e2-xxxx-xxxxxxxxxxxx",
    "direction": "inbound",
    "from": "+140xxxxxxx",
    "to": "+44177xxxxxxx",
    "call_id": "fba5f700-dd3a-123c-xxxx-xxxxxxxxxxxx",
    "sip_status": 200,
    "sip_reason": "OK",
    "call_status": "in-progress",
    "account_sid": "1a3d4a19-a1e9-483f-xxxx-xxxxxxxxxxxx",
    "trace_id": "896c407644c5f22d84e5d492f503f06a",
    "application_sid": "d6a219b6-683a-4e04-xxxx-xxxxxxxxxxxx",
    "fs_sip_address": "",
    "originating_sip_ip": "",
    "originating_sip_trunk_name": "Twilio",
    "api_base_url": "",
    "refer_status": 500
  "numberMetaData": {
    "number": "+140xxxxxxx",
    "country": "US",
    "countryCallingCode": "1",
    "nationalNumber": "40xxxxxxx",
    "valid": true,
    "type": "FIXED_LINE_OR_MOBILE",
    "uri": "tel:+140xxxxxxx"