VAPI

Vapi helps developers build, test, and deploy voice agents at scale. We enable everything in between the raw models and production, including telephony, test suites, and real-time analytics.

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VAPI

Vapi helps developers build, test, and deploy voice agents at scale. We enable everything in between the raw models and production, including telephony, test suites, and real-time analytics.

Join

support

faq

multiple-amethyst

10/1/2025

when we are calling in batch it should dial number one by one as i have only 1 chanel from my provid

I am writing to raise a concern regarding the concurrency handling of outbound calls through your platform. Currently, my account is provisioned with 10 channels, and when I initiate multiple outbound calls, all channels are utilized simultaneously. However, my SIP trunk provider (Tata Communications) allows only 1 concurrent call. Because of this, calls beyond the single allowed channel are rejected by Tata, which causes operational issues. To resolve this, I would like to request the following: An option in the VAPI platform to adjust or limit the number of concurrent outbound calls....

rival-black

10/1/2025

On outbound calls, the assistant should start speaking only after the client answers, but right now

im not talking about answering machine please help ik you will ask about call id bbut all my calls are like this you can check any call for that ill add my last call id 0199a18f-a6ac-7882-99a0-eff2d591cab2

other-emerald

10/1/2025

Workflow Issue - Call duration

Tried to find call duration setting at phone numbers but it doesnt seem to appear. See SS's

continuing-cyan

10/1/2025

2 ISSUES: 11Labs voice "skipping" & channel won't change from 'weekly' to 'daily'

Hi @Vapi Team! My business heavily relies on this voice from 11Labs and a few days ago, it started sound funny, kind of "skipping", here's an example: call id: 9b97e511-6e29-44cc-b31f-88505fc005ea It sounds as if it was a broken record. So, while trying to fix it, I wanted to change the channel of my org and it just won't switch from 'weekly' to 'daily/default'. After I click "Switch Channel", it changes but then after refreshing the page, it's back to 'weekly'. ...

wise-white

10/1/2025

Key Error

I am receiving this error. I haven't done anything weird.

fair-rose

10/1/2025

Is there a way to detect when a tool is not called?

My problem is the following: I created a call agent and integrated it with n8n. From the webhook, I call some functions in the tools (for scheduling and other tasks) and also store data in my database. What I need to know is this: if I disable my n8n instance or if it goes down, is there any way to detect that it’s offline and say something else? Because when I tested it, I turned off my n8n and spoke with the agent, and it continued through the flow, but without calling the webhook. If that happens, I’d like to either end the call or send a maintenance message (or something similar)....

eastern-cyan

10/1/2025

Enterprise plan support

My team has reached out support channels couple of times to upgrade us to Enterprise plan but unfortunately Vapi team has never responded. Can i have some support person attention to upgrade? Would like to discuss further over from my enterprise email ID. please let me know. :my_emoji:

like-gold

10/1/2025

GPT realtime robotic voice on a call

When I try GPT realtime for my assistant, it works fine on Web, but when I call the Vapi number on my phone, the voice is sound like it's on a slow motion and it's robotic. But if you listen to the call log after, it sounds fine! sample call ID: 9e0ccca2-5848-4c16-962b-f12299b6ca54...

optimistic-gold

10/1/2025

Vapi CLI useless - latest CLI version 0.2.1 cannot talk with API

cannot be deserialized as a *api.AssistantModel Error: incompatible API response format Usage: vapi assistant list [flags] ...

equal-aqua

10/1/2025

Transcriber does not work on assistant

Issue: I chosed gladia as transcriber and it cannot work in assistant and i tried api key integration and it says api key wrong. 1. Navigate to assistant and select an assistant 2. Change transcriber to gladia and model solaria. Select all languages 3. Publish and talk to assistant...

optimistic-gold

10/1/2025

GPT Realtime Cluster - Does not speak first + speaks in random language

Hi, no matter how i try the assistant does never speaks first when i set it via "First Message Mode". It either waits for the user to speak then speaks the first message or when on the auto-generated message starts to behave in a non predictable way, can speak in any language, or just halluciante a conversation. Someone one elses's issue: #Realtime API not abiding by first message, opens with some default message every time....

exotic-emerald

10/1/2025

Outgoing Campaign Stuck in Scheduled Status

We're having a problem with an outgoing campaign. We set up our campaign, Minnesota 1k Leads 20251001 Campaign ID="b4b0dff6-38c5-4244-a507-d40925210dfc", to send immediately. However, it is still stuck in "scheduled" status and has not been sent. We have confirmed that there are no other outgoing campaigns currently running. This is a recurring issue. I also sent a message about this in the Discord office hours but did not get a response. Please see attached pictures....

ugly-tan

10/1/2025

Alternative knowledge base after trieve?

After sunsetting Trieve on Nov 1, what’s the recommended alternative for a knowledge base? I understand we have two options: building a custom solution or using the query tool with Gemini. Based on my experience so far, Gemini’s performance both in latency and accuracy is significantly worse compared to what Trieve provided. Hosting Trieve ourselves or creating our own knowledge base solution is not a trivial task (as shown by the number of SaaS companies focusing solely on this area), and it would be preferable if this were provided directly by Vapi. What’s the official stance on this?...

wise-white

10/1/2025

background noise turned off but still there

Hello there! We have The Voice Configuration -> Additional Configuration -> Background Noise set to 'off' but when we call the 'default' is still palying (office space).
We tried even setting it to a silent mp3, but, still no, anytime w call her, it's using the background noise. ...

sensitive-blue

10/1/2025

Over concurrency limit

Dear all, good afternoon! We need a solution to this case. I understand both what happened and what the solution is....

helpful-purple

10/1/2025

URGENT — webhook returned 422; WebSocket/answer handshake failing (Call ID 04992d02...)

Hi Vapi Engineering, This is urgent and needs to be fixed as a permanent change. Problem: Telnyx reports our webhook https://api.vapi.ai/telnyx/inbound_call returned HTTP 422 on a production call (Call Session ID: 04992d02-9ec0-11f0-9583-02420aef32a0, time 2025-10-01 12:13 UTC). Because of that, Telnyx's answer to open the bidirectional WebSocket/RTP audio stream failed, and inbound caller audio never reached the assistant....

harsh-harlequin

10/1/2025

SIP Trunk Phone number

I can't make it work to use a BYOW SIP phone number. I am filling in these settings (assume username and password also is set). And I can save these settings and I can also create the phone number with these settings (inside second screenshot). But when I try to make an outbound call, nothing happens. Whereas when I do the exact same in Retell, it works. How come?...

painful-plum

10/1/2025

how to import/get international phone numbers

Hello community, I am from uzbekistan, and i was trying to build calling agents, but i cannot find where to get uzbek phones, either they are not supported on any platform i do not know. If you guys know please let me know, i am really struggling....

flat-fuchsia

10/1/2025

Workflow Node traversal not available

I'm looking for a way to find after a Workflow call happened which Nodes/Path was taken through the graph. I was told that call.artifact.nodes should have the traversal. But that property is an empty array for me (there is a transcript, so nodes were definitely invoked). ID is "01999bec-4fb2-7ff3-93ac-9a1c3508691e" if that helps

fascinating-indigo

10/1/2025

Transfer call doesn't work

Hello! I've encountered a problem with transfer call, it doesn't work somehow....