Infrastructure for AI voice

The infrastructure layer that makes AI voice communication possible.

Phone numbers, live call audio, speech, and agents as building blocks you program. Route calls like an Express app. Run it in our cloud, or on your own servers.

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pbx.js

const dialpress = require('dialpress') const app = dialpress() app.register('/internal/:ext', auth, (req, res) => res.status(200).set('Contact', req.get('Contact')).end()) app.invite('/internal/:ext', async (req, res) => { const { outcome } = await res.dial(`user:${req.params.ext}`, { timeout: 20 }) if (outcome === 'busy') return res.sendStatus(486) res.end() }) app.invite('/inbound/:did', (req, res) => res.handoff('/ai/front-desk')) app.connect({ address: 'agi.dialpress.ai' })const dialpress = require('dialpress') const app = dialpress() const internal = dialpress.Router() const auth = dialpress.digestAuth({ realm: 'acme', password: db.passwordFor }) internal.param('ext', async (req, res, next, ext) => { req.user = await db.users.find(ext) next() }) // *80 + extension: intercom internal.invite('/\\*80:ext', (req, res) => res.page(`user:${req.params.ext}`)) internal.invite('/:ext', auth, async (req, res) => { await res.dial(`user:${req.params.ext}`, { timeout: 20 }) res.end() }) app.use('/internal', internal) app.hangup('/internal/:ext', (req) => cdr.save(req.ended)) app.use((err, req, res, next) => res.sendStatus(err.status ?? 500))const dialpress = require('dialpress') const bot = dialpress() bot.invite('/ai/:name', async (req, res) => { await res.answer() const media = await res.media({ sampleRate: 16000 }) media.on('audio', (pcm) => stt.write(pcm)) // caller voice llm.on('reply', async (t) => media.play(await tts(t))) vad.on('speech', () => media.clear()) // barge-in res.on('dtmf', (d) => d === '0' && res.handoff('/internal/0', { summary: llm.summary() })) }) bot.connect({ address: 'agi.dialpress.ai', pathPrefixes: ['/ai'] })const dialpress = require('dialpress') const app = dialpress() app.register('/internal/:ext', auth, (req, res) => res.status(200).set('Contact', req.get('Contact')).end()) app.invite('/internal/:ext', async (req, res) => { const { outcome } = await res.dial(`user:${req.params.ext}`, { timeout: 20 }) if (outcome === 'busy') return res.sendStatus(486) res.end() }) app.invite('/inbound/:did', (req, res) => res.handoff('/ai/front-desk')) app.connect({ address: 'agi.dialpress.ai' })

$ node pbx.js

connection READY · gateway agi.dialpress.ai

claimed /internal /inbound · methods INVITE REGISTER

INVITE /inbound/15550100 → handoff /ai/front-desk

Works with the models and infrastructure you already run

01 — Build your voice stack

Not just a phone API.

DialPress is a complete voice backend. The gateway, the media path, speech, agents, and messaging run as one system, so a call never leaves the stack between the carrier and your model.

The primitives

How DialPress works

01

Voice Gateway

SIP trunks, phone numbers, and WebRTC in one gateway, with STIR/SHAKEN, 10DLC, and E911 at the edge.

02

Numbers & Trunking

Phone numbers, SIP trunks to any carrier, failover between carriers, and SMS over SMPP.

03

Media Streams

The live audio of any call, in your code, both ways, in real time.

04

Speech

Streaming recognition, text to speech, and keyword spotting, on your GPUs or a cloud provider.

05

Agents

Voice and chat agents that answer from your knowledge base and call your APIs over MCP.

06

Messaging

SMS, email, SIP MESSAGE, and HTTP behind one message model.

07

Softphone

A client for the web, iOS, and Android on your own SIP accounts.

Bring the voice model you trust

Speech-to-speech or speech, model, and voice: switch with one line, keep the same tools and call handling.

All integrations

01

OpenAI Realtime

gpt-realtime as a speech-to-speech agent. The call’s G.711 audio goes to it as it is.

02

Gemini Live

Gemini’s native audio models from AI Studio or Vertex, with barge-in and tools.

03

ElevenLabs

ElevenLabs Agents, Scribe live transcription, and your own cloned voices.

04

Deepgram

Deepgram Voice Agent, Nova live recognition with key terms, and Aura 2 voices.

02 — Program it like a web app

Calls are requests. Your code answers them.

Your app connects to the gateway over gRPC and receives every SIP request at a path from the dial plan. If you can write an Express app, you can run a phone system.

Three ideas behind the SDK

They are the ideas of a web framework, applied to calls.

Routes, not state machines

app.invite, app.register, app.message. Middleware, params, and async handlers work as they do in Express 5.

Audio in your code

res.media() streams the caller’s audio to your speech recognition and plays your text to speech back, with barge-in.

Handoffs keep the call

res.handoff() moves a live call between a bot and a person. Same call ID, no transfer, no dropped audio.

A PBX and an AI bot on one gateway

Each app claims its own paths. The PBX hands a caller to the bot; the bot hands the same call back with a summary when the caller asks for a person.

Read the developer overview

Routes like Expresspbx.js

const dialpress = require('dialpress') const app = dialpress() app.register('/internal/:ext', auth, (req, res) => res.status(200).set('Contact', req.get('Contact')).end()) app.message('/internal/:ext', (req, res) => res.proxy(`user:${req.params.ext}`)) app.invite('/internal/:ext', async (req, res) => { const { outcome } = await res.dial(`user:${req.params.ext}`, { timeout: 20 }) if (outcome === 'busy') return res.sendStatus(486) res.end() }) app.invite('/inbound/:did', (req, res) => res.handoff('/ai/front-desk')) app.connect({ address: 'agi.dialpress.ai' })const dialpress = require('dialpress') const app = dialpress() app.register('/internal/:ext', auth, (req, res) => res.status(200).set('Contact', req.get('Contact')).end()) app.message('/internal/:ext', (req, res) => res.proxy(`user:${req.params.ext}`)) app.invite('/internal/:ext', async (req, res) => { const { outcome } = await res.dial(`user:${req.params.ext}`, { timeout: 20 }) if (outcome === 'busy') return res.sendStatus(486) res.end() }) app.invite('/inbound/:did', (req, res) => res.handoff('/ai/front-desk')) app.connect({ address: 'agi.dialpress.ai' })

03 — Run it anywhere

From one laptop to a fleet of GPUs.

The same apps and routes run in DialPress cloud, on one Linux server, with Docker Compose, or on Kubernetes. Each module scales on its own.

Self-hosting

Pricing that follows your team, not your lines

Per-user plans with no per-line or regulatory fees.

Free to try

14 days of the full platform, with 250 AI voice minutes. No credit card.

No surprise fees

10DLC, STIR/SHAKEN, and E911 are bundled. Porting is free.

Self-hosted, quoted

Run DialPress on your own servers on an enterprise agreement.

Put an agent on the phone.

npm install dialpress, connect to the gateway, and answer your first call in code.

Start building

See pricing