Warm Experimental transfer
# support
a
HI i am using the warm experimental , within vapi (transfer call) but its getting stuck in a endless ringing i want it to get back to the caller if the transfer call didnt reply
s
happy to help @AbhishekShar if u still have the issue
a
yes i still have the issue
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{
  "id": "4550f04c-e5f8-45e8-94ba-70011dcf3020",
  "createdAt": "2026-02-17T16:56:02.725Z",
  "updatedAt": "2026-02-17T17:01:51.159Z",
  "type": "transferCall",
  "function": {
    "name": "transfer_call_tool",
    "description": "Transfer to agent when caller provides name"
  },
  "messages": [
    {
      "type": "request-start",
      "content": "",
      "blocking": true
    },
    {
      "type": "request-failed",
      "content": "Sorry, couldn't reach the agent. Would you like them to call you back?",
      "endCallAfterSpokenEnabled": false
    }
  ],
  "orgId": "6bd56ca5-90e9-402e-a6b2-d780b0f571bb",
  "destinations": [
    {
      "type": "number",
      "number": "+1234567890",
      "description": "Transfer destination",
      "transferPlan": {
        "mode": "warm-transfer-experimental",
        "message": "I have a caller on the line for you.",
        "sipVerb": "refer",
        "summaryPlan": {
          "enabled": true,
          "messages": [
            {
              "role": "system",
              "content": ""
            },
            {
              "role": "user",
              "content": ""
            }
          ],
          "timeoutSeconds": 5,
          "useAssistantLlm": false
        },
        "fallbackPlan": {
          "message": "Sorry, couldn't reach anyone. How else can I help?",
          "endCallEnabled": false
        }
      },
      "numberE164CheckEnabled": true
    }
  ]
}
s
r u using the paid twilio number @AbhishekShar ? if not, can u pls try doing that?
i saw similar issue
a
yes i am using the paid twillio number
so the usecase is , i wanted assistant to connect to the caller again if the transfer fails
for now its calling the other person but if the voice mail is there its just getting stuck over there , do we need to disable the voice mail , if yes after ending will it come back to the caller again or will it just hung up https://cdn.discordapp.com/attachments/1473338395768918193/1473552404518666402/image.png?ex=6996a01e&is=69954e9e&hm=3fa50845e69cefe7fabe6f80e2ba30b5eac2d4172ec234bdc2aed0ff394828cf&
s
r u using your own built tool or VAPI can u build your own tool to transfer the call?
a
i am using my own tool to transfer the call if something need to be added in the json above let me know
s
u r doing everything what works, still the issue
where did u build the tool
c
hi, could you please also provide the call id where this occurs?