diff --git a/twilio-voice-app/.env.example b/twilio-voice-app/.env.example new file mode 100644 index 0000000..0a2e8f3 --- /dev/null +++ b/twilio-voice-app/.env.example @@ -0,0 +1,14 @@ +# Twilio credentials +TWILIO_ACCOUNT_SID=ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX +TWILIO_AUTH_TOKEN=your_auth_token +TWILIO_PHONE_NUMBER=+1234567890 + +# Publicly accessible URL (https://...) that Twilio can reach. +# When running locally use a tunneling tool such as ngrok and paste the HTTPS URL. +PUBLIC_SERVER_URL=https://your-ngrok-id.ngrok-free.app + +# Optional: choose a Pollinations voice for TTS playback +POLLINATIONS_VOICE=nova + +# Port for the local Express server +PORT=4000 diff --git a/twilio-voice-app/.gitignore b/twilio-voice-app/.gitignore new file mode 100644 index 0000000..713d500 --- /dev/null +++ b/twilio-voice-app/.gitignore @@ -0,0 +1,2 @@ +node_modules/ +.env diff --git a/twilio-voice-app/README.md b/twilio-voice-app/README.md new file mode 100644 index 0000000..7d9fe3a --- /dev/null +++ b/twilio-voice-app/README.md @@ -0,0 +1,82 @@ +# Unity Voice Call Assistant + +A lightweight Node + Twilio companion service that lets Unity call a phone number and hold a spoken conversation powered by the Pollinations text API. Users receive an automated phone call, hear Unity's response rendered via Pollinations text-to-speech, and can answer verbally—Twilio transcribes the caller's speech and the cycle continues. + +## Features + +- ✅ **Phone call initiation** – Trigger a call to any E.164 phone number from the web UI. +- 🧠 **Unity text brain** – Conversations use the same Pollinations text API powering Unity Chat. +- 🔊 **Voice playback** – Assistant replies are played with Pollinations TTS directly over the call. +- 🗣️ **Two-way dialog** – Twilio speech recognition captures the caller's reply and routes it back to the AI. +- 🌐 **Self-hosted UI** – Includes a simple dashboard to start calls and watch status updates. + +## Prerequisites + +- A Twilio account with an active phone number (trial accounts work while you remain within verified numbers). +- Node.js 18+ (for native `fetch`). +- A public HTTPS URL that Twilio can reach (use [ngrok](https://ngrok.com/), [Cloudflare Tunnel](https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/), etc.). + +## Getting started + +1. Install dependencies: + ```bash + cd twilio-voice-app + npm install + ``` +2. Copy the example environment file and fill in your details: + ```bash + cp .env.example .env + ``` + Required variables: + - `TWILIO_ACCOUNT_SID`, `TWILIO_AUTH_TOKEN`, `TWILIO_PHONE_NUMBER` + - `PUBLIC_SERVER_URL` – The **public** HTTPS URL that Twilio will call back (e.g. your ngrok tunnel). + - Optional: `POLLINATIONS_VOICE` to choose a different Pollinations voice preset. +3. Start the server: + ```bash + npm start + ``` +4. Expose the running server: + ```bash + # Example using ngrok (server must already be running on PORT) + ngrok http 4000 + ``` +5. Update `PUBLIC_SERVER_URL` in your `.env` with the HTTPS forwarding address printed by ngrok and restart the server if needed. + +Visit [http://localhost:4000](http://localhost:4000) to load the dashboard, enter a phone number, and press **Call My Phone**. Answer the incoming call from your Twilio number to begin the voice chat. + +## Twilio configuration tips + +- Trial accounts can only call verified numbers. Add your mobile phone to the **Verified Caller IDs** page in the Twilio Console. +- Ensure your Twilio phone number has **Voice** capabilities enabled. +- The application automatically provides TwiML at: + - `POST /voice-response` + - `POST /gather` + Twilio uses those URLs during the call flow, so they must be publicly reachable. + +## Conversation flow + +1. The web UI sends the phone number and optional topic to `POST /api/start-call`. +2. The server creates a session, asks the Pollinations text API for the first reply, and kicks off the phone call through Twilio. +3. When the call is answered, Twilio requests `/voice-response`, which streams the Pollinations TTS audio and immediately starts a speech gather. +4. The caller speaks. Twilio transcribes the response and POSTs it to `/gather`. +5. The server sends the transcription back to the Pollinations text API, receives a new answer, and responds with more TwiML to keep the dialog going. + +Each assistant reply is constrained to a short length so the Pollinations TTS GET endpoint can render it reliably. + +## Development notes + +- Sessions are stored in memory. Restarting the server will drop active conversations. +- If the Pollinations API or TTS call fails, the server gracefully ends the phone call to avoid trapping the caller. +- The UI keeps an activity log and status banner so you can monitor attempts and errors from the browser. + +## Troubleshooting + +| Symptom | Fix | +| --- | --- | +| Call fails immediately | Double-check Twilio credentials and verify the destination number. | +| No audio plays | Confirm your ngrok tunnel is active and that the Pollinations TTS URL is reachable from the public internet. | +| Gather never hears me | Make sure you stay on the line and speak after Unity finishes. Background noise can reduce Twilio's speech recognition confidence. | + +## Security reminder + +This sample app runs entirely server-side so your Twilio credentials remain private. 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"dev": "nodemon server.js" + }, + "dependencies": { + "dotenv": "^16.4.5", + "express": "^4.19.2", + "twilio": "^4.23.0", + "uuid": "^9.0.1", + "node-fetch": "^3.3.2" + }, + "devDependencies": { + "nodemon": "^3.1.4" + } +} diff --git a/twilio-voice-app/public/client.js b/twilio-voice-app/public/client.js new file mode 100644 index 0000000..56ea3cb --- /dev/null +++ b/twilio-voice-app/public/client.js @@ -0,0 +1,66 @@ +const form = document.getElementById('call-form'); +const statusEl = document.getElementById('status'); +const logEl = document.getElementById('log'); +const submitBtn = form.querySelector('button[type="submit"]'); + +function timestamp() { + return new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' }); +} + +function log(message, type = 'info') { + const item = document.createElement('li'); + item.className = `log__item log__item--${type}`; + item.innerHTML = `${timestamp()}${message}`; + logEl.prepend(item); +} + +function setStatus(message, variant = 'idle') { + statusEl.textContent = message; + statusEl.dataset.state = variant; +} + +async function startCall(payload) { + const response = await fetch('/api/start-call', { + method: 'POST', + headers: { 'Content-Type': 'application/json' }, + body: JSON.stringify(payload) + }); + + if (!response.ok) { + const errBody = await response.json().catch(() => ({})); + const errorMessage = errBody.error || 'Failed to start call.'; + throw new Error(errorMessage); + } + + return response.json(); +} + +form.addEventListener('submit', async (event) => { + event.preventDefault(); + const formData = new FormData(form); + const phoneNumber = formData.get('phoneNumber'); + const initialPrompt = formData.get('initialPrompt'); + const voice = formData.get('voice'); + + submitBtn.disabled = true; + setStatus('Creating session and contacting Twilio…', 'pending'); + log(`Attempting to call ${phoneNumber} using the ${voice} voice.`, 'info'); + + try { + const result = await startCall({ phoneNumber, initialPrompt, voice }); + setStatus(result.message || 'Call in progress. Answer your phone!', 'success'); + log('Call initiated successfully. Pick up to talk with Unity.', 'success'); + if (result.gatherPrompt) { + log(`On the call, you will hear: “${result.gatherPrompt}”`, 'hint'); + } + } catch (error) { + console.error(error); + setStatus(error.message, 'error'); + log(error.message, 'error'); + } finally { + submitBtn.disabled = false; + } +}); + +setStatus('Ready when you are.', 'idle'); +log('Configure your .env values, run the server, and Unity will call when you press the button.'); diff --git a/twilio-voice-app/public/index.html b/twilio-voice-app/public/index.html new file mode 100644 index 0000000..84efc16 --- /dev/null +++ b/twilio-voice-app/public/index.html @@ -0,0 +1,64 @@ + + + + + + Unity Voice Call Assistant + + + +
+
+

Unity Voice Call Assistant

+

+ Start a phone call where Unity chats with you using Pollinations text and Twilio voice. +

+
+ +
+

Start a Voice Chat

+
+ + + + + + + + + + +
+ +
+
+ +
+

How it works

+
    +
  1. Fill in your phone number and (optionally) a topic.
  2. +
  3. Answer the incoming call from your Twilio number.
  4. +
  5. Unity speaks using Pollinations text-to-speech and waits for your reply.
  6. +
  7. Your speech is transcribed, sent to the Unity text API, and the cycle repeats.
  8. +
+

+ Keep the call open and speak clearly. Each response is limited to a short, natural sentence so the Pollinations TTS link stays reliable. +

+
+ +
+

Call Activity

+ +
+
+ + + + diff --git a/twilio-voice-app/public/styles.css b/twilio-voice-app/public/styles.css new file mode 100644 index 0000000..7f2b831 --- /dev/null +++ b/twilio-voice-app/public/styles.css @@ -0,0 +1,193 @@ +:root { + color-scheme: light dark; + font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; + background-color: #0f172a; + color: #f8fafc; +} + +body { + margin: 0; + min-height: 100vh; + background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 55%), + radial-gradient(circle at bottom right, rgba(147, 51, 234, 0.18), transparent 60%), + #020617; +} + +.app { + max-width: 960px; + margin: 0 auto; + padding: 3rem 1.5rem 4rem; + display: grid; + gap: 1.75rem; +} + +.app__header { + text-align: center; +} + +.app__header h1 { + font-size: clamp(2.5rem, 4vw, 3.2rem); + margin-bottom: 0.4rem; + letter-spacing: -0.03em; +} + +.app__tagline { + margin: 0 auto; + max-width: 520px; + color: rgba(248, 250, 252, 0.75); +} + +.card { + background: rgba(15, 23, 42, 0.85); + border: 1px solid rgba(148, 163, 184, 0.12); + border-radius: 18px; + padding: 1.75rem; + box-shadow: 0 24px 48px rgba(2, 6, 23, 0.45); + backdrop-filter: blur(14px); +} + +.card h2 { + margin-top: 0; + font-size: 1.5rem; +} + +.form { + display: grid; + gap: 1rem; +} + +.form__label { + font-weight: 600; +} + +.form__input, +.form__textarea, +.form__select { + width: 100%; + padding: 0.75rem 0.9rem; + font-size: 1rem; + border-radius: 12px; + border: 1px solid rgba(148, 163, 184, 0.3); + background: rgba(15, 23, 42, 0.6); + color: inherit; +} + +.form__textarea { + resize: vertical; + min-height: 120px; +} + +.form__submit { + margin-top: 0.75rem; + padding: 0.85rem 1.4rem; + font-size: 1.05rem; + border-radius: 999px; + border: none; + background: linear-gradient(135deg, #38bdf8, #8b5cf6); + color: #020617; + font-weight: 700; + cursor: pointer; + transition: transform 0.2s ease, box-shadow 0.2s ease; +} + +.form__submit:disabled { + opacity: 0.5; + cursor: wait; +} + +.form__submit:not(:disabled):hover { + transform: translateY(-1px); + box-shadow: 0 18px 32px rgba(59, 130, 246, 0.45); +} + +.status { + margin-top: 1.5rem; + padding: 0.9rem 1rem; + border-radius: 14px; + background: rgba(59, 130, 246, 0.18); + border: 1px solid rgba(59, 130, 246, 0.35); + min-height: 2.5rem; + display: flex; + align-items: center; + font-weight: 600; +} + +.status[data-state='pending'] { + background: rgba(251, 191, 36, 0.18); + border-color: rgba(251, 191, 36, 0.45); +} + +.status[data-state='success'] { + background: rgba(34, 197, 94, 0.2); + border-color: rgba(34, 197, 94, 0.45); +} + +.status[data-state='error'] { + background: rgba(248, 113, 113, 0.22); + border-color: rgba(248, 113, 113, 0.55); +} + +.steps { + margin: 0; + padding-left: 1.2rem; + color: rgba(226, 232, 240, 0.86); +} + +.steps li + li { + margin-top: 0.4rem; +} + +.hint { + margin-top: 1rem; + color: rgba(148, 163, 184, 0.9); +} + +.log { + list-style: none; + margin: 0; + padding: 0; + display: grid; + gap: 0.75rem; +} + +.log__item { + display: flex; + gap: 0.75rem; + align-items: baseline; + padding: 0.75rem 1rem; + border-radius: 14px; + background: rgba(15, 23, 42, 0.6); + border: 1px solid rgba(148, 163, 184, 0.2); +} + +.log__item--success { + border-color: rgba(34, 197, 94, 0.5); +} + +.log__item--error { + border-color: rgba(248, 113, 113, 0.55); +} + +.log__item--hint { + border-color: rgba(59, 130, 246, 0.45); +} + +.log__time { + font-family: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; + font-size: 0.85rem; + opacity: 0.7; +} + +.log__message { + flex: 1; +} + +@media (max-width: 640px) { + .app { + padding: 2.5rem 1rem; + } + + .card { + padding: 1.4rem; + } +} diff --git a/twilio-voice-app/server.js b/twilio-voice-app/server.js new file mode 100644 index 0000000..fc42295 --- /dev/null +++ b/twilio-voice-app/server.js @@ -0,0 +1,274 @@ +const express = require('express'); +const twilio = require('twilio'); +const { v4: uuidv4 } = require('uuid'); +const path = require('path'); +const dotenv = require('dotenv'); + +dotenv.config({ path: path.resolve(__dirname, '.env') }); + +let fetchImpl = global.fetch; +if (!fetchImpl) { + fetchImpl = (...args) => import('node-fetch').then(({ default: fetch }) => fetch(...args)); +} + +const PORT = process.env.PORT || 4000; +const PUBLIC_SERVER_URL = process.env.PUBLIC_SERVER_URL; +const TWILIO_ACCOUNT_SID = process.env.TWILIO_ACCOUNT_SID; +const TWILIO_AUTH_TOKEN = process.env.TWILIO_AUTH_TOKEN; +const TWILIO_PHONE_NUMBER = process.env.TWILIO_PHONE_NUMBER; +const DEFAULT_VOICE = process.env.POLLINATIONS_VOICE || 'nova'; + +const hasTwilioCredentials = + Boolean(TWILIO_ACCOUNT_SID && TWILIO_AUTH_TOKEN && TWILIO_PHONE_NUMBER); + +if (!hasTwilioCredentials) { + console.warn('[WARN] Twilio credentials are not fully configured. API routes will return errors.'); +} +if (!PUBLIC_SERVER_URL) { + console.warn('[WARN] PUBLIC_SERVER_URL is not set. Twilio callbacks will fail without a public URL.'); +} + +const app = express(); +app.use(express.json()); +app.use(express.urlencoded({ extended: true })); + +app.use(express.static(path.join(__dirname, 'public'))); + +const sessions = new Map(); + +const SYSTEM_PROMPT = + 'You are Unity Voice, an AI assistant speaking with a caller over the phone. ' + + 'Keep every reply under 200 characters, speak naturally, and ask follow-up questions to keep the chat going.'; + +const client = hasTwilioCredentials + ? twilio(TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN) + : null; + +function sanitizeForTts(text) { + if (!text) return ''; + const compact = text.replace(/\s+/g, ' ').trim(); + if (compact.length <= 380) return compact; + return `${compact.slice(0, 377)}...`; +} + +function createTtsUrl(text, voice = DEFAULT_VOICE) { + const sanitized = sanitizeForTts(text); + const encoded = encodeURIComponent(sanitized); + const url = new URL(`https://text.pollinations.ai/${encoded}`); + url.searchParams.set('model', 'openai-audio'); + url.searchParams.set('voice', voice); + return url.toString(); +} + +async function fetchPollinationsResponse(session, userMessage) { + if (userMessage && userMessage.trim()) { + session.messages.push({ role: 'user', content: userMessage.trim() }); + } + + const payload = { + model: 'openai', + messages: session.messages, + temperature: 0.8, + max_output_tokens: 300, + top_p: 0.95, + presence_penalty: 0, + frequency_penalty: 0, + stream: false + }; + + const response = await fetchImpl('https://text.pollinations.ai/openai', { + method: 'POST', + headers: { 'Content-Type': 'application/json' }, + body: JSON.stringify(payload) + }); + + if (!response.ok) { + const body = await response.text(); + throw new Error(`Pollinations API error: ${response.status} ${body}`); + } + + const data = await response.json(); + const assistantMessage = data?.choices?.[0]?.message?.content?.trim(); + if (!assistantMessage) { + throw new Error('Pollinations API returned an empty response.'); + } + + session.messages.push({ role: 'assistant', content: assistantMessage }); + session.lastAssistant = assistantMessage; + return assistantMessage; +} + +function createSession(phoneNumber, initialVoice = DEFAULT_VOICE) { + const id = uuidv4(); + const session = { + id, + phoneNumber, + voice: initialVoice, + messages: [{ role: 'system', content: SYSTEM_PROMPT }], + lastAssistant: null + }; + sessions.set(id, session); + return session; +} + +function buildGatherAction(sessionId) { + return `/gather?sessionId=${sessionId}`; +} + +function buildVoiceResponse(session, twiml, promptMessage, gatherPrompt) { + const responseMessage = session.lastAssistant || promptMessage; + if (!responseMessage) { + twiml.say('I was not able to prepare a message. Goodbye.'); + twiml.hangup(); + return twiml; + } + + const audioUrl = createTtsUrl(responseMessage, session.voice); + twiml.play(audioUrl); + + const gather = twiml.gather({ + input: 'speech', + action: buildGatherAction(session.id), + method: 'POST', + speechTimeout: 'auto', + language: 'en-US' + }); + + if (gatherPrompt) { + gather.say(gatherPrompt); + } else { + gather.say('Please share your reply after the tone.'); + } + gather.pause({ length: 1 }); + + twiml.say('No response detected. Ending the call.'); + twiml.hangup(); + return twiml; +} + +async function startPhoneCall(session) { + if (!client) { + throw new Error('Twilio client is not configured.'); + } + if (!PUBLIC_SERVER_URL) { + throw new Error('PUBLIC_SERVER_URL is not configured.'); + } + + const voiceUrl = new URL('/voice-response', PUBLIC_SERVER_URL); + voiceUrl.searchParams.set('sessionId', session.id); + + return client.calls.create({ + url: voiceUrl.toString(), + to: session.phoneNumber, + from: TWILIO_PHONE_NUMBER, + method: 'POST' + }); +} + +app.post('/api/start-call', async (req, res) => { + try { + const { phoneNumber, initialPrompt, voice } = req.body || {}; + if (!phoneNumber || typeof phoneNumber !== 'string') { + return res.status(400).json({ error: 'A destination phoneNumber is required.' }); + } + if (!client) { + return res.status(500).json({ error: 'Twilio credentials are missing on the server.' }); + } + if (!PUBLIC_SERVER_URL) { + return res.status(500).json({ error: 'PUBLIC_SERVER_URL is not configured on the server.' }); + } + + const session = createSession(phoneNumber.trim(), voice || DEFAULT_VOICE); + const gatherPrompt = 'After the message, speak your reply and stay on the line for the assistant to respond.'; + + if (initialPrompt && initialPrompt.trim()) { + await fetchPollinationsResponse(session, initialPrompt); + } else { + await fetchPollinationsResponse(session, 'Greet the caller briefly and ask how you can help.'); + } + + await startPhoneCall(session); + + res.json({ + sessionId: session.id, + status: 'initiated', + message: 'Call started. Answer the phone to begin the voice chat.', + gatherPrompt + }); + } catch (error) { + console.error('Failed to start call', error); + res.status(500).json({ error: error.message || 'Failed to start call.' }); + } +}); + +function getSession(req) { + const sessionId = req.query.sessionId || req.body.sessionId; + if (!sessionId) { + return { errorTwiml: new twilio.twiml.VoiceResponse().say('Session not provided.') }; + } + const session = sessions.get(sessionId); + if (!session) { + const twiml = new twilio.twiml.VoiceResponse(); + twiml.say('The session has expired. Please start a new call.'); + twiml.hangup(); + return { errorTwiml: twiml }; + } + return { session }; +} + +async function handleVoiceResponse(req, res) { + const { session, errorTwiml } = getSession(req); + if (!session) { + res.type('text/xml').send(errorTwiml.toString()); + return; + } + + const twiml = new twilio.twiml.VoiceResponse(); + buildVoiceResponse(session, twiml, null, 'Please leave your reply after the tone.'); + res.type('text/xml').send(twiml.toString()); +} + +app.post('/voice-response', handleVoiceResponse); +app.get('/voice-response', handleVoiceResponse); + +app.post('/gather', async (req, res) => { + const { session, errorTwiml } = getSession(req); + if (!session) { + res.type('text/xml').send(errorTwiml.toString()); + return; + } + + const speechResult = req.body?.SpeechResult; + const confidence = req.body?.Confidence; + + console.log(`Gathered speech for session ${session.id}:`, speechResult, 'confidence:', confidence); + + const twiml = new twilio.twiml.VoiceResponse(); + + if (!speechResult) { + twiml.say('I did not hear anything. Let me repeat myself.'); + buildVoiceResponse(session, twiml, null, 'Please respond after the message.'); + res.type('text/xml').send(twiml.toString()); + return; + } + + try { + await fetchPollinationsResponse(session, speechResult); + buildVoiceResponse(session, twiml, null, 'Share your next reply when you are ready.'); + } catch (error) { + console.error('Error generating AI response:', error); + twiml.say('Something went wrong while generating a response. I will end the call now.'); + twiml.hangup(); + } + + res.type('text/xml').send(twiml.toString()); +}); + +app.use((err, req, res, next) => { + console.error('Unhandled server error:', err); + res.status(500).json({ error: 'Internal server error.' }); +}); + +app.listen(PORT, () => { + console.log(`Twilio voice bridge listening on port ${PORT}`); +});