Bird vs Twilio for Voice
Bird brings SIP trunking, versioned IVR call sequences, and call recordings into the same workspace as your SMS, WhatsApp, and email channels. Twilio centers Programmable Voice on webhook-driven TwiML instructions and ConversationRelay speech sessions.
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How Bird and Twilio compare across voice workflows
Compare how each platform handles IVR call menus, live AI voice agents, and backend routing decisions.
| Capability | Bird | Twilio |
|---|---|---|
| Calling workflow | Run versioned call sequences with spoken prompts, keypad menus, and named branches without hosting a webhook server. | Return TwiML XML instructions from your webhook server to control prompts, keypad input, and dialing. |
| Live AI speech | Bridge phone calls over SIP to your AI voice runtime so your agent controls speech recognition, reasoning, and tools. | Use ConversationRelay for managed speech recognition and synthesis while your backend handles dialogue over a WebSocket. |
| Application decisions | Execute structured IVR branches in Bird sequences and route live calls to your PBX or conversational server over SIP. | Respond to per-step TwiML webhooks from your application server during the call. |
When is Twilio a strong choice?
Twilio fits teams whose applications already generate dynamic TwiML verbs on every call step, embed Twilio Voice client SDKs in browsers or mobile apps, or rely on ConversationRelay for managed speech-to-text and text-to-speech.
When should you choose Bird?
Choose Bird when you want to publish versioned IVR call sequences without maintaining TwiML webhook endpoints, connect your PBX or AI voice runtime over authenticated SIP trunks, and keep call logs and recordings alongside SMS, WhatsApp, and email in one workspace.
Can I move TwiML directly into Bird?
No. TwiML is Twilio's XML webhook format, while Bird runs versioned call sequence packages or routes calls over SIP trunks. Rebuild fixed greetings, keypad menus, recordings, and transfers as a Bird call sequence, and route dynamic application logic or AI voice conversations to your SIP server.
How should you compare the full cost?
Price the complete call using your real destination countries, inbound and outbound call mix, and average call duration. Include monthly phone number rental, per-minute carrier rates for each connected leg, recording or transcription fees, and any speech recognition, LLM, or voice synthesis costs.
What does a careful migration involve?
Audit your TwiML endpoints, Studio flows, Elastic SIP Trunks, Voice SDK clients, ConversationRelay sessions, recordings, and status callbacks so you can separate carrier connectivity from application logic.
Map TwiML flows and SIP trunks
Convert structured greetings and keypad menus into a versioned Bird call sequence, configure a Bird SIP trunk for your PBX or AI voice server, and plan a speech runtime replacement if your app uses ConversationRelay.
Test a complete call end to end
Assign a test number in Bird and place real calls to verify two-way audio, keypad input, AI tool calls, transfer handling, and call detail records while Twilio continues serving production.
Port numbers and cut over traffic
Confirm number portability for each country, bind ported or newly provisioned numbers to your verified Bird trunk or sequence, and shift live traffic in stages.
Questions about Bird and Twilio
Can I move TwiML directly into Bird?
Can I keep my current phone numbers?
How should I evaluate call quality?
Should I start self-serve or talk to a Voice specialist?
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Primary documentation
Related resources
Continue with the documentation, guides and examples for this topic.
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Plan your Twilio migration.
Review your phone numbers, TwiML webhooks, and SIP trunk architecture with our team, and validate a complete call flow on Bird before porting live traffic.