Live Call Control | Vapi
# office-hoursa
Alex
11/25/2025, 3:14 PMHello!
I'm following the Live Call Control docs at https://docs.vapi.ai/calls/call-features , but I don't see any monitor object being returned after I create the call. Am I missing something? Or perhaps I'm not on the right Vapi tier?
Alex
11/25/2025, 3:14 PMHere is my request to https://api.vapi.ai/call
> {
> method: 'POST',
> headers: {
> Authorization: 'Bearer ...',
> 'Content-Type': 'application/json'
> },
> body:
{"customer":{"number":"..."},"phoneNumberId":"...","assistant":{"voice":{"provider":"vapi","voiceId":"Elliot","speed":0.75},"firstMessageMode":"assistant-waits-for-user","voicemailDetection":{"provider":"vapi"},"backgroundSound":"off","modelOutputInMessagesEnabled":true,"model":{"provider":"openai","model":"gpt-4o","messages":[{"role":"system","content":"..."}],"temperature":0},"firstMessage":"...","endCallFunctionEnabled":true,"endCallMessage":"Goodbye.","transcriber":{"model":"nova-2","language":"en","provider":"deepgram","confidenceThreshold":0.3},"startSpeakingPlan":{"waitSeconds":0.9,"smartEndpointingPlan":{"provider":"vapi"}},"stopSpeakingPlan":{"voiceSeconds":0.3}}}Alex
11/25/2025, 3:16 PMMy response:
> {
> "success": true,
> "data": {
> "subscriptionLimits": {
> "concurrencyBlocked": false,
> "concurrencyLimit": 10,
> "remainingConcurrentCalls": 9
> },
> "id": "...",
> "phoneNumberId": "...",
> "type": "outboundPhoneCall",
> "createdAt": "...",
> "updatedAt": "...",
> "orgId": "...",
> "cost": 0,
> "assistant": {
> "model": {
> "model": "gpt-4o",
> "messages": [
> {
> "role": "system",
> "content": "..."
> }
> ],
> "provider": "openai",
> "temperature": 0
> },
> "voice": {...},
> "transcriber": {
> "model": "nova-2",
> "language": "en",
> "provider": "deepgram",
> "confidenceThreshold": 0.3
> },
> "firstMessage": "...",
> "endCallMessage": "...",
> "backgroundSound": "off",
> "firstMessageMode": "...",
> "stopSpeakingPlan": {
> "voiceSeconds": 0.3
> },
> "startSpeakingPlan": {
> "waitSeconds": 0.9,
> "smartEndpointingPlan": {
> "provider": "vapi"
> }
> },
> "voicemailDetection": {
> "provider": "vapi"
> },
> "endCallFunctionEnabled": true,
> "modelOutputInMessagesEnabled": true
> },
> "customer": {
> "number": "..."
> },
> "status": "queued",
> "phoneCallProvider": "twilio",
> "transport": {
> "conversationType": "voice",
> "provider": "twilio",
> "accountSid": "..."
> }
> }
> }