Global DID numbers and SIP connectivity for Vapi and other AI voice platforms

Virtual Phone Numbers for AI Voice Agents

Connect Telnexx DID numbers to Vapi through documented DIDWW SIP integration
Support inbound and outbound AI calling over standard SIP
Transfer active calls from an AI agent to a human agent or PBX

Use Telnexx virtual phone numbers as the telephony layer for AI voice agents. DIDWW officially documents SIP integration with Vapi for inbound calls, outbound calls, DID assignment and live call transfers.

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From Telnexx number to AI conversation

Telnexx DID

Choose a local, national, mobile or toll-free Telnexx number as the entry point for your AI voice workflow.

DIDWW SIP → Vapi

Route the number through DIDWW SIP to Vapi using the documented integration for inbound and outbound AI calling.

AI Agent → Human / PBX

The AI agent handles the conversation and can transfer the active call to a human agent, external number or PBX when needed.

Why use Telnexx numbers for AI voice agents

Global number coverage

Choose local, national, mobile or toll-free numbers in supported markets and connect them to an AI voice workflow.

Inbound and outbound calling

Receive calls into an AI assistant and, where outbound service is enabled, place calls through DIDWW SIP trunks.

SIP-based architecture

Use standard SIP instead of locking the phone number to a single AI platform or proprietary telephony stack.

AI voice agent use cases

AI receptionist

Answer incoming calls, route requests and handle common questions automatically.

Lead qualification and sales

Qualify prospects and support outbound sales workflows with an AI voice agent.

Customer support

Automate first-line support and transfer complex conversations to a human agent.

After-hours and overflow

Keep calls answered outside business hours or when your team is busy.

How to connect a Telnexx number to an AI voice agent

1

Choose your number

Select the country and DID number type you need for your AI voice workflow.

2

Choose your AI platform

Use Vapi or another supported SIP-compatible AI voice platform.

3

Configure SIP routing

We connect the DID and SIP route so calls reach the AI assistant and outbound calling can be configured where required.

4

Launch and optimize

Test the call flow, human handoff and routing, then move the workflow into production.

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Frequently asked questions about AI voice numbers

Yes. DIDWW officially documents Vapi connectivity through SIP for inbound calls, outbound calls, DID assignment and active-call transfers. Telnexx provides the DID number and SIP connectivity layer.

Yes, where outbound service is enabled and configured. Vapi can place outbound calls through a DIDWW outbound SIP trunk using authenticated SIP credentials.

Yes. The documented Vapi setup supports transferring an active call to an external phone number through DIDWW, so the call can be handed to a human agent or PBX workflow.

DIDWW currently publishes integration guides for Vapi, Retell AI, ElevenLabs and LiveKit. Configuration and available features depend on the selected platform and calling scenario.

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