Put your AI voice agent on a real phone line.

Connect your AI voice agent or realtime speech model to local phone numbers and SIP trunks without managing telecom carriers yourself. Handle inbound support, appointment booking, and order status checks over the phone, transfer callers to a human queue with full context, and inspect recordings, transcripts, and disconnect reasons in Bird.

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Inbound support and booking

Resolve routine phone requests from first ring to confirmed action.

Build AI voice agents that answer inbound support lines, reschedule appointments, check order statuses, and place outbound reminder calls. Callers speak naturally in their own words while your agent gathers the required details, runs the action in your backend tools, and confirms the result before hanging up.

Verify callers and pull live account context

Look up the caller's phone number against your CRM, ticketing tool, or order database as the call connects. Your application controls which account records the agent can read and which actions require caller verification first.

Confirm bookings and updates against your system of record

Prevent unverified confirmations by waiting for your scheduling or order system to return a committed status before the agent speaks the outcome. If a slot is taken or an API call fails, the agent can offer another time or transfer the caller.

Telephony and SIP routing

How does an AI voice agent connect to phone numbers?

Bird handles the phone numbers, carrier routing, SIP trunking, and call recording while your AI voice runtime handles speech recognition, reasoning, and voice synthesis. Point a Bird phone number at your SIP-compatible agent server to answer inbound calls, or dial out through a Bird SIP trunk using verified caller IDs.

  1. 01

    Bring your own AI voice runtime over SIP

    Connect a SIP-capable voice agent or realtime speech server using IP allowlists, digest authentication, and encrypted TLS signaling. You stay in control of speech models, barge-in handling, latency tuning, and tool calling while Bird manages carrier connectivity.

  2. 02

    Transfer live calls to a human with full context

    Route the active call to a support queue, PBX extension, or forwarding number when a caller asks for a person or hits an edge case. Pass the caller's request and verified details along so your team picks up the conversation without asking the customer to repeat themselves.

Call records and quality review

Inspect recordings, transcripts, and disconnect reasons in one place.

An answered call does not guarantee a resolved issue. Review call audio, turn-by-turn transcripts, ringing and talk duration, and SIP disconnect reasons alongside your application logs so you can spot where callers hang up, get stuck, or ask for a person.

Audit transcripts against real caller behavior

Replay recorded calls with configurable retention and access controls to see how your agent handles interruptions, background noise, regional accents, and slow tool responses on real phone lines.

Control destination countries and calling spend

Start with a specific support line or outbound workflow, restrict which destination countries your trunk can dial, and monitor answer rates and escalations before expanding the agent to more numbers.

Questions about AI Voice

Is AI Voice the same as a phone menu?
No. A phone menu follows predefined choices such as keypad digits. An AI voice conversation interprets language and generates responses through a conversational runtime. Both still need a complete call-routing and outcome-handling design.
Can I use my existing AI runtime?
A SIP-capable runtime can connect through Bird when its signaling, authentication and media behavior are compatible. Validate the integration with a real call in both directions before moving traffic.
Does an MCP connection make a conversational voice agent?
No. MCP lets an authorized software agent operate account tools. A live voice agent additionally needs audio, speech processing, turn-taking and a conversation application.
Can the assistant book appointments or look up orders?
Connect those actions through your application’s authorized tools. Treat their returned status as the source of truth, and require the appropriate customer confirmation before making a change.
What should I measure?
Measure call connection and completion separately from task success. Track the confirmed business result, escalation rate and observed failure reasons; a transcript or an answered call alone cannot prove conversion.

Connect the rest of your voice stack

AI Voice guide Connect your voice agent runtime over SIP, configure media settings, and test live calls.

SIP trunking Link your PBX, contact center, or voice AI media server to Bird phone numbers with TLS and country controls.

Call sequences Build spoken greetings, keypad menus, and fallback routing branches before handing calls to an agent.

Voice pricing Check published per-minute rates by destination country and call direction.

Scale without
losing control.

Organize teams in workspaces, control API access, and trace changes through audit logs.

WorkspacesTeam rolesAPI authentication
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