SIP2AI

Connect VAPI AI to Your SIP PBX

SIP2AI makes it effortless to attach powerful AI agents to your SIP accounts and phone systems. Route calls, transfer intelligently, capture transcripts, and automate follow‑ups — all in minutes.

Note: a VAPI Private Key is required to link your AI agent to SIP. Add it during setup.
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What You Can Do with SIP2AI

Add / Edit AI Agent

  • Agent Name / Internal Reference
    Name your agent (e.g., AivaVoxence) and keep a private reference for operations.
  • Enable or Disable
    Instantly toggle availability without deleting configuration.

Agent Context

  • Start Message
    Example (English): “Hello, this is Aiva from Company, how can I help you?”
  • Context
    Define tone, scope, and guardrails the agent must follow.
  • Built‑in Tools
    query_tool – Perform lookups and searches (a knowledge base is auto‑linked when you save an agent).
    callback_request_tool – Trigger a human call‑back.
    terminate_connection_tool – End the session when requested.
    custom_call_transfer_tool – Transfer based on intent or logic to departments or numbers.
  • Identity
    You are Aiva, an assistant at Voxence.

Knowledge Base

Use “Open the knowledge base” to add information to your agent.

Example Configuration SIP Endpoint & Agent

You can create VAPI Agents and attach them to a SIP endpoint.

Datacenter Location

For example, if you set it to 2, the AI agent will wait 2 seconds before answering the call. Can be useful when human agents are also available to pick up the call.

Agent Context

Transfer Settings

Call Back Requests

Transcription Settings

Call Limits

You can currently allocate up to 3 for this agent (including its existing capacity).
Configuration is validated locally before being sent to the server.

Realtime Call Control Portal

What you see during an active call

  • Agent: Ben de Weerman
  • Caller name: Jan de Vries
  • Number: 0612349876
  • Start: 11 Jul 2025, 13:05:50

In‑call controls

Monitor or intervene when needed:

  • 🎧 Listen — silently monitor the call in realtime.
  • 🔁 Transfer — warm/attended or blind transfer to an extension or external number.
  • ❌ End Call — terminate the current session.
  • 💬 Type message… → 🗣️ Say — send a live prompt for the AI to speak to the caller.

Realtime transcript (example)

[13:05:52] Assistant: Hello, this is Ben the Weatherman.
[13:05:53] Caller: Hello, can you tell me the weather in Amsterdam?
[13:05:56] Assistant: In Amsterdam it is currently 22 °C and sunny.

Portal preview

AI Assistant Call Control Portal – demo
Easy to use and understand

Pricing & Calculator

Licenses start at $2 per channel per month. From 10 channels onward, volume discounts automatically apply.

Simple per‑channel pricing

Start at $2.00 per concurrent call ("channel") per month. From 10+ channels we apply tiered, psychological discounts. Prices below are indicative and auto‑calculated.

Drag to simulate volume (1–500). For larger volumes, type the number.
Unit price
$2.00
Monthly total
$2.00
Savings vs $2.00 base
$0.00
Tier: 1–9 channels @ $2.00/channel. Discounts kick in at 10+.
Register Now
You can upgrade, downgrade, or cancel anytime.

Discount tiers

  • 1–9 channels — $2.00 per channel / month
  • 10–19 channels — $1.89 per channel / month
  • 20–49 channels — $1.79 per channel / month
  • 50–99 channels — $1.49 per channel / month
  • 100–249 channels — $1.29 per channel / month
  • 250+ channels — $0.99 per channel / month

Prices are billed monthly. Taxes may apply.

Frequently Asked Questions

What is the difference between SIP2AI and VAPI?

SIP2AI is the bridge between your SIP PBX and VAPI. It allows you to configure your AI agents and SIP endpoints in a user-friendly way. VAPI is the backend that handles the AI logic.

Can I add multiple agents?

Yes, you can add multiple agents to your SIP2AI account. Each agent will have its own settings and can be configured independently.

Can I add multiple customers?

You can become a reseller and add multiple customers to your SIP2AI account.

Do I need a VAPI Private Key?

Yes. To connect your AI agent to SIP, a VAPI Private Key is mandatory. Without it, registration and calls will not be established.

Which codecs are supported?

SIP2AI prioritizes G722, PCMU, and PCMA. You can customize priorities in the configuration.

Can the AI transfer calls?

Yes it can transfer internal and external calls. Enable Transfer and set a timeout and destination. You can choose to announce a summary of the AI conversation before transfer.

Where do transcripts go?

Send transcripts to an email address, a webhook URL, or both. You can add a shared secret for webhook delivery.

What about pricing and licenses?

We charge a fixed fee of 2$ per license per month. With one license, you can have one concurrent call, when you have 20 licenses, you can have 20 concurrent calls. When the limit is reached, calls will be transferred to the destination you specified or dropped. You can purchase licenses for your agents in the dashboard. Contact us for more information.

What payments do you accept?

We accept payments via PayPal and Stripe.

Can I still configure the settings in VAPI?

Yes, when you create an agent in SIP2AI, it will be automatically added to VAPI. You can then configure the settings in VAPI. The settings in VAPI will override the settings in SIP2AI.

Can I use my custom tools in VAPI?

Yes, we added 4 default tools for transfer, query, callback, and end conversation. But when you attach a tool in VAPI, it will be available to the AI agent.

What PBX / SIP servers are supported?

SIP2AI works with any PBX that supports SIP. You can use it with any PBX that supports SIP. We have done extensive testing with 3CX, Asterisk, FreePBX, PortaOne, MirtaPBX, and more.