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Korea AI Telecom
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Platform

One platform, every layer of a call

KAT runs the telecom layer under its own licences and builds AI, messaging, payments and data on top. Everything below runs on that one stack.

Five layers, and who runs each

We operate the telecom layer ourselves. Where we rely on partners for a piece of a layer, we say so.

L5Data

Recordings & summaries · Dashboards & analytics · API & webhooks · Slack, Jandi, Notion, Google

Run by KAT

L4Payments

In-call payment, without hanging up

BetaAvailable inside ZeroCall

L3Messaging

SMS · LMS · MMS · KakaoTalk business messages · KakaoTalk support chat

Run by KAT, delivered through messaging partners

L2AI

Speech-to-text · LLM dialogue · Real-time TTS · Industry task modules

Pipeline orchestrated by KAT. Speech recognition and language models come from cloud AI providers.

L1Telecom

Two telecom licences · Number issuance & porting · SIP switch · Routing, IVR & queues · SIP trunking

Operated by KAT. Calls to other networks pass through standard interconnection with partner carriers.

We hold the licence. We run the switch.

KAT is a registered Korean telecom carrier. We issue business numbers and run our own SIP switch, and the two licences together cover the line and the AI on top of it.

Held

Facilities-based telecom carrier

Registration No. 1-01-25-0027

Lets us issue phone numbers and provide voice transmission ourselves.

Held

Special-category value-added telecom operator

Registration No. 3-01-25-0010

Covers AI answering, recording, transcription and messaging under one operator.

Operated directly

  • Number issuance
  • SIP switch
  • Number porting
  • Routing: IVR, queues, simultaneous & sequential ringing, extensions, fallback
  • SIP trunking

Numbers we issue

070 business numbers

Main lines and per-staff direct lines

Live in about a minute

Local numbers02, 031 and more

A local presence for stores and offices

National numbers15xx · 16xx · 18xx

One memorable number for the whole business

Calls to and from other networks pass through standard interconnection with partner carriers. Existing numbers can be ported in.

AI that works on a phone line

It hears, decides, speaks and acts on real calls, through line noise and dropouts. If one step lags, the conversation breaks, so each part is tuned for live phone audio.

  1. 01 · Hear

    Speech-to-text

    Transcribes speech through line noise and dropouts.

  2. 02 · Decide

    LLM dialogue management

    Remembers what was said and decides what to say and do next.

  3. 03 · Speak

    Real-time TTS

    Answers in a natural voice, fast enough to keep the conversation going.

  4. 04 · Act

    Industry task modules

    Booking, intake and notices, handled the way each industry needs.

AI levels · each level includes the ones before it

  1. Level 1Live

    Recording

  2. Level 2Live

    Transcript & summary

  3. Level 3Live

    AI voice agent inbound & outbound

  4. Level 4Live

    Voice selection & custom voices

Processor list coming

Where the AI runs

KAT orchestrates the pipeline on AWS. Speech recognition and language models come from cloud AI providers under contract, including transfer outside Korea.

See security & trust

Languages

  • KoreanLive
  • Chinese speech-to-textComing soon
  • Japanese speech-to-textComing soon
Granted

Patent

AI agent contact center integrated with booking platforms

Korean Patent No. 10-3022994 (2026)

Everything a business call needs

What the infrastructure does today, with a status on every item.

  • LiveIn production
  • BetaAvailable, still changing
  • Coming soonPlanned

Numbers

  • 070 numbersLive
  • Local numbers (02, 031…)Live
  • National numbers (15xx, 16xx, 18xx)Live
  • Number portingLive
  • Direct lines per staff memberLive

Call flow

  • Spam & blocklistLive
  • Business-hours routingLive
  • IVRLive
  • QueuesLive
  • Simultaneous & sequential ringingLive
  • ExtensionsLive
  • Direct-line routing with fallbackLive
  • Sticky agent: callers reach the same agent againLive
  • Outbound campaigns with recorded messagesLive
  • AI outboundLive

AI

  • Call recordingLive
  • Transcript & summaryLive
  • AI voice agentLive
  • Voice selection & custom voicesLive
  • Chinese & Japanese speech-to-textComing soon

Messaging

  • SMS, LMS, MMSLive
  • KakaoTalk business messages (AlimTalk, FriendTalk)Live
  • KakaoTalk support chatLive

Touchpoints

  • Mobile app & PC dashboardLive
  • Standard SIP desk phonesLive
  • SIP trunk to your PBXLive

Payments

  • In-call paymentBeta

Data

  • Dashboards & analyticsLive
  • API & webhooksLive
  • Slack, Jandi, Notion, GoogleLive
  • CRMComing soon

Status as of October 2026.

Fits the phone system you already have

Keep your PBX, your desk phones and your tools. KAT adds Korean lines and an AI agent on top, over standard SIP.

Live

Mobile app & PC

Answer and make calls from phone or desktop through ZeroCall, on the same number.

zerocall.kr ↗
Live

SIP desk phones

Standard SIP desk phones register to our switch. Send us the model and we’ll confirm.

Live

Enterprise PBX over SIP trunk

Keep your exchange and add our lines and AI. Avaya Aura is a compatible environment, over SIP trunk and VPN.

Other SIP-compatible PBXs: ask us and we’ll confirm the setup.

Ask about your PBX

For developers

Voice API, SIP trunk, Number API and webhooks: build on the same Korean lines we run. API documentation on request.

Request API documentation

Collaboration tools

  • Slack

    Live

    Call alerts in your channels

  • Jandi

    Live

    Call alerts for teams on Jandi

  • Notion

    Live

    Call records in your workspace

  • Google

    Live

    Call records in Google

  • CRM

    Coming soon

    Customer records built from call history

Plan your setup with us

Tell us what you’re building and what you run today, and we’ll suggest a setup that fits.

Talk to usInfrastructure inquiry