# A better call starts with a useful answer.

Choose a calling path, prepare the connection and understand the result. Find practical guides, technical references and clear explanations, connected to the Voice capability you want to build.

[Start for Free](/dashboard/signup?returnTo=%2Fdashboard%2Fw%2Fvoice%2Fonboarding)

[Contact sales](/demo?product=voice&source_page=%2Fproducts%2Fvoice%2Fresources)

## Set up with your agent

[Read the agent setup guide](/docs/ai/set-up-your-agent)

Copy this prompt into your coding agent:

```text
Bird connects customer communications, data and automation. Help me build with Bird using my coding agent.
1. Read https://bird.com/docs/ai/set-up-your-agent.md and follow its setup workflow for this client. Use an existing connected Bird MCP server or signed-in CLI when available.
2. Read the product guide for the task I want to complete and inspect my existing integration. Identify the workspace, available operations and required setup.
3. Help me complete a first example for the product and destination I choose. Follow the operation through to its actual result, explain any uncertainty, and help me choose the next step.

First task: Choose the Voice guide for my task and work through its verified setup requirements. First use the connected Bird MCP server or signed-in CLI for a read-only inventory. Discover the available tools and read their schemas or help; do not invent call-control operations. If neither surface is available, follow https://bird.com/docs/ai/set-up-your-agent.md. Read the linked guides through their .md alternatives. Present the exact target and configuration before changing routing, placing calls, recording audio, purchasing numbers or submitting a port. Obtain my approval for those actions.

Use this Bird page as the starting context: https://bird.com/products/voice/resources
Read its Markdown alternative and linked guides. Keep the first example relevant to this page and the customer outcome I choose. Preserve the supplied campaign context when following Bird signup or sales links.
```

Trusted every day by teams that build world-class software

[Read more customer stories](/customers)

- [Airwallex](/customers/airwallex)
- [Glovo](/customers/glovo)
- [Zillow](/customers/zillow)
- Uber
- [Binance](/customers/binance)
- Adobe
- Meta
- PayPal
- Pinterest
- Square
- [Al Jazeera](/customers/aljazeera)
- [Aramex](/customers/aramex)
- [Bazaar Technologies](/customers/bazaar)
- [ComparaOnline](/customers/compara)
- [Emma](/customers/emma)

[Capabilities](#capabilities)

[Implementation guides](#guides)

[Voice explained](#explained)

[Migration guides](#migration)

## Start with your customer journey

- [SIP trunking](/products/voice/sip-trunking): Connect your PBX, softphone or SIP application to the telephone network.
- [Call sequences](/products/voice/call-sequences): Turn prompts, keypad choices and named branches into a versioned workflow.
- [AI Voice](/products/voice/ai-voice): Bring a conversational runtime to the phone, with your context, tools and handoff.
- [Inbound routing](/products/voice/inbound-routing): Connect each number to your phone system, forwarding target or call sequence.
- [Browser calling](/products/voice/browser-calling): Place an outbound call from your workspace with a browser phone and your SIP trunk.
- [Recordings and transcripts](/products/voice/recordings): Review captured audio and transcripts alongside the call that produced them.
- [Voice analytics](/products/voice/analytics): Understand outcomes, duration and rated costs, then inspect the individual call.
- [Outbound calling](/products/voice/outbound-calls): Connect callbacks and service conversations, then reconcile the final call outcome.
- [Voice numbers](/products/voice/numbers): Prepare inbound numbers, caller identity and a supported number migration.
- [Contact center connections](/products/voice/contact-center): Keep your agent workflows and connect the telephone network through SIP.
- [WhatsApp customer conversations](/products/whatsapp): Continue customer conversations on WhatsApp.

## Configure and operate Voice

- [Call log](/docs/guides/voice/call-log): Browse, filter, and export every call your workspace placed or received, and read why a call was refused: statuses, timings, billable time, and cost.
- [Call sequences](/docs/guides/voice/call-sequences): Design and publish Bird Voice sequences for greetings, keypad menus and outbound notifications, with controlled testing and consistent call behavior.
- [Caller IDs](/docs/guides/voice/caller-ids): Register the numbers your workspace presents on outbound calls and prove you own them with a verification call, on the Numbers page in the dashboard.
- [Voice destinations](/docs/guides/voice/destinations): Choose the countries your workspace calls by enabling them on the Destinations page, and read what the availability and high risk labels mean on that list.
- [Voice events](/docs/guides/voice/events): The three voice call webhook events, what each one means in the life of a call, the fields they carry, and how to consume them without double counting.
- [Place your first call](/docs/guides/voice/first-call): Place a browser call through a SIP trunk, confirm two-way audio, and inspect the resulting call record in the dashboard or Voice API.
- [Voice overview](/docs/guides/voice/overview): What Bird Voice is, how a call travels between your phone system and the telephone network over a SIP trunk, and where your calls show up.
- [Phone](/docs/guides/voice/phone): Place calls from the Bird dashboard over your own SIP trunk: what a browser call needs, the controls during a call, and where the calls show up.
- [Placing calls](/docs/guides/voice/placing-calls): What has to be true before your first outbound call, what Bird expects on the SIP INVITE, how the Digest handshake works, and how a call is priced.
- [Receiving calls](/docs/guides/voice/receiving-calls): Point a number you hold at one of your SIP trunks or forward it to a verified number, and read what a number did with an incoming call.
- [Recordings and transcripts](/docs/guides/voice/recordings): Review captured Voice audio and transcripts in context, follow artifact processing and connect each recording to the call and session that produced it.
- [SIP client setup](/docs/guides/voice/sip-clients): Point a softphone or a PBX at a Bird SIP trunk, with the settings every client needs and worked configurations for Asterisk, FreePBX, Zoiper, and baresip.
- [SIP trunks](/docs/guides/voice/sip-trunks): Create a SIP trunk, turn on each direction, read its connection details, and control which addresses, API keys, and session credentials may send calls to it.
- [Voice troubleshooting](/docs/guides/voice/troubleshooting): Diagnose a Bird Voice call from its symptom: missing from the call log, rejected with or without a reason, an incoming call nobody answers, or one-way audio.
- [Connect an AI voice application](/docs/ai/voice-conversations): Prepare the SIP connection, business actions and human handoff.

## Voice explained

- [WebRTC vs SIP, which do I use for a browser or an AI agent?](/explained/voice/webrtc-vs-sip): They are not alternatives. WebRTC specifies the media and leaves signaling out on purpose, and SIP is signaling. A browser call usually runs both.
- [What do SIP response codes mean, and why did I get a 503?](/explained/voice/what-do-sip-response-codes-mean): The codes are HTTP-shaped and mostly read that way. The exception matters: a 503 from Bird is a refusal it will not explain on the wire, not an overload.
- [What is a call detail record (CDR)?](/explained/voice/what-is-a-call-detail-record): One record per call leg, carrying the outcome, the timings and the cost. Not every call produces one, and the cost arrives after the call does.
- [What is a SIP trunk, and do I need one?](/explained/voice/what-is-a-sip-trunk): A trunk connects your side to Bird's network, and every call crosses one. What differs is whether a phone system or a lighter SIP client sits behind it.
- [What is a voice AI agent, and how does it connect to the phone network?](/explained/voice/what-is-a-voice-ai-agent): Understand the conversational runtime, telephone connection and confirmed business outcome.
- [What is a voice API?](/explained/voice/what-is-a-voice-api): Understand call control, SIP connectivity and the records behind a conversation.
- [What is SIP?](/explained/voice/what-is-sip): SIP arranges calls and then steps out of the way. The audio travels on a separate path, which is why a call that connects with no sound is a normal failure.
- [What is STIR/SHAKEN, and what are attestation levels A, B and C?](/explained/voice/what-is-stir-shaken): Attestation is a claim the signing provider makes about what it checked, not a score for your call. A, B and C say how much of you it could vouch for.
- [What is toll fraud, and how does Bird limit it?](/explained/voice/what-is-toll-fraud): An attacker dials premium numbers through your phone system. Bird refuses those number types, a country list bounds the rest, and ceilings cap the spend.
- [What is VoIP?](/explained/voice/what-is-voip): VoIP carries calls as IP packets. The consequential category is interconnected VoIP, which turns on access to the public switched telephone network.
- [Why is my call labeled Spam Likely or Scam Likely?](/explained/voice/why-is-my-call-labeled-spam-likely): The label is applied by the carrier that delivers the call, not the one that carried it. Blocking and labeling are different, and only one has a route back.

## Plan a Voice migration

- [Migrate from Twilio](/docs/guides/voice/migrate/twilio): Map TwiML, call control, numbers and conversation behavior to the replacement workflow.
- [Migrate from Telnyx](/docs/guides/voice/migrate/telnyx): Plan SIP, call control and managed-assistant responsibilities before moving traffic.
- [Migrate from Vonage](/docs/guides/voice/migrate/vonage): Map NCCO instructions, webhooks and number routing to the Bird call lifecycle.
- [Migrate from Vapi](/docs/guides/voice/migrate/vapi): Decide whether to change the telephone connection, the assistant runtime or both.
- [Migrate from Bland](/docs/guides/voice/migrate/bland): Inventory Pathways, tool actions, SIP routing and the evidence each call must retain.
- [Migrate from Bandwidth](/docs/guides/voice/migrate/bandwidth): Map SIP realms, numbers and the application behind your calls.
- [Migrate from Plivo](/docs/guides/voice/migrate/plivo): Map Zentrunk connectivity and any call-control dependencies before a cutover.

## Make your next decision

- [Voice platform](/products/voice): Return to the complete calling platform.
- [Voice FAQs](/products/voice/faqs): Browse practical questions by capability.
- [Getting started](/products/voice/getting-started): Prepare and verify a controlled first call.
- [Voice pricing](/pricing/voice): Review destination rates and the components of your call.
- [Voice comparisons](/products/voice/compare): Compare the calling model and migration path across providers.

## Put the guide to work.

Follow the setup guide that matches your calling path. Bring the workflow and the point where you need help to our Voice team.

[Read the Voice setup guide](/products/voice/getting-started)