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Wixzel Voice
Inbound support line

AI phone support line from your own knowledge base

Most support calls ask the same few questions, and callers wait on hold while your team answers them one at a time. For product and service teams with a support number and a set of answers that repeat: upload the answers as a knowledge base, attach it to an agent, and route the number to it. The agent answers from what you gave it, every call is transcribed, and you pay per second of talk time from a prepaid balance.

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An inbound support line answered from a knowledge base, with a hand-off to a person

How do you build an AI phone support agent with Wixzel Voice?

  1. 01
    POST /v1/knowledge-bases

    Upload the documents or answers the agent may draw on.

  2. 02
    POST /v1/agents

    Create the agent with the knowledge base attached, a tone, and the escalation rule.

  3. 03
    POST /v1/sip-trunks

    Route the support number's trunk to the platform for inbound calls.

  4. 04
    Turn taking

    Tune interrupt_sensitivity and silence_wait_ms so callers can cut in without the agent talking over them.

  5. 05
    GET /v1/calls

    Review transcripts, find the questions the knowledge base did not cover, and improve it.

Which voice engine fits an inbound support line?

Use the gemini-live engine on Wixzel Voice, at $0.0491 per connected minute. Support calls are conversational and interruption-heavy; a realtime engine keeps the turn latency lowest. The classic engine is the cheaper choice if cost matters more than snappiness.

What does an inbound support line cost on Wixzel Voice?

Wixzel Voice engine time for 4-minute calls on the gemini-live engine, at typical speech rates, billed per second of actual usage. Telephony is your own trunk at your carrier’s rate and is not included, and shorter calls cost proportionally less.

Calls per monthConnected minutesEngine cost per month
3001,200$58.92
1,5006,000$295
6,00024,000$1,178

Prepaid: add credit from $5 and the calls spend it. Estimate your own mix.

Which guides show how to build an AI phone support agent on Wixzel Voice?

Build a Twilio AI receptionist in Node.js with Wixzel Voice

Answer your existing Twilio number with an AI receptionist that books appointments, using a Twilio Elastic SIP trunk and the Wixzel Voice TypeScript SDK.

Gemini Live on a real phone call with the Wixzel Voice API

Put Google's Gemini Live model on a real phone call over your own SIP trunk with four cURL requests, then read the call record with its transcript and cost.

AI phone call API

Four requests to a ringing phone, what a call record returns, and what a call costs.

Bring your own SIP trunk

Twilio, Telnyx, Plivo, Vonage, Bandwidth, Exotel, Vobiz, Mobily or any SIP provider: what to set at the carrier.

Frequently asked questions

Can a Wixzel Voice agent answer questions from my own documents?

Yes. A knowledge base is uploaded through the API and attached to the agent, which answers from it during the call.

Can callers interrupt the agent?

Yes. interrupt_sensitivity on the agent governs how readily it stops talking when the caller speaks. Short acknowledgements like "yes" never interrupt at any setting; they are queued and answered when the agent finishes.

What if the agent does not know the answer?

Give it an escalation rule in the prompt: take a message, promise a callback, or transfer the caller to a person. A transfer bridges the call over your SIP trunk to a number you listed in the agent's human_transfer settings, never to one the model makes up. The transcript shows you which questions to add to the knowledge base.

What does a four-minute support call cost?

About 0.196 dollars on the gemini-live engine, or 0.346 on classic, plus your carrier's rate.

What else do agencies and developers build on Wixzel Voice?

Appointment booking

Build an agent that answers the phone, checks availability and books an appointment, over your own SIP trunk, with the booking written back through the API.

Outbound lead qualification

Upload leads, start a campaign, and have an agent call each one over your own SIP trunk and ask your qualifying questions. Every call is a record with its status and transcript, linked to the lead.

Indian languages

Run phone agents in Indian languages on models built for them, with the sarvam engine covering speech-to-text, the language model and text-to-speech end to end.

Web and mobile apps

Put an agent in a browser page, a Flutter app or a kiosk with no SIP trunk and no phone number: your server mints a one-minute session, the app streams audio over a WebSocket, and the session is billed like a call.

Website voice assistant

Put a talking AI assistant on your website with one script tag: an agent made from your site, with an animated mascot visitors call from the browser, caller details, who-can-call settings and daily caps.

Phone calls from AI agents

Connect Claude Code, Codex, Cursor or any MCP client to your account, and let an AI agent connect a carrier, build a voice agent, place calls, run campaigns and read transcripts, with every tool that spends money asking first.

Low-cost AI calling

Run AI phone calls for a few cents a minute: per-second billing from prepaid credit, no subscription or minimum, your own SIP trunk with no telephony markup, and every charge itemised.

Talking AI avatar

Give a voice agent a face: an animated avatar that lip-syncs to the agent, for a website, a share link, a web app or a Flutter app, with no fee for the avatar.

For agencies

Build a phone agent for each client on their own account and carrier, in their language, and charge a retainer on a cost billed per second.

All Wixzel Voice facts

Operator, prices, limits, refunds and data location, on one page.

Build your first voice agent

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