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import { createServer } from "http";
import { WebSocketServer } from "ws";
import { randomUUID } from "crypto";
const app = express();
const server = createServer(app);
const wss = new WebSocketServer({ server, path: "/audio-stream" });
app.use(express.static("public", { index: false }));
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
const PORT = process.env.PORT || 7860;
const TELNYX_API_KEY = process.env.TELNYX_API_KEY;
const TELNYX_CONNECTION_ID = process.env.TELNYX_CONNECTION_ID;
const TELNYX_FROM_NUMBER = process.env.TELNYX_FROM_NUMBER;
const AI_SERVER_URL = process.env.AI_SERVER_URL;
const ACTIVE_VOICE = "Enceladus_3";
const log = (tag, ...args) => console.log(`[${new Date().toISOString()}] [${tag}]`, ...args);
let callLogs = [];
const sendTelnyxCmd = async (callId, action, body = {}) => {
if (action === "playback_start") {
updateLog(callId, { is_playing: true, playback_started_at: Date.now() });
}
try {
const response = await fetch(`https://api.telnyx.com/v2/calls/${callId}/actions/${action}`, {
method: "POST",
headers: { "Content-Type": "application/json", Authorization: `Bearer ${TELNYX_API_KEY}` },
body: JSON.stringify(body)
});
if (!response.ok) log("TELNYX CMD ERROR", `[${action}] ${await response.text()}`);
else log("TELNYX CMD SUCCESS", `[${action}] accepted.`);
return response;
} catch (e) { log("TELNYX CMD NETWORK ERROR", e.message); }
};
const updateLog = (callId, updates) => {
const entry = callLogs.find(l => l.call_control_id === callId);
if (entry) Object.assign(entry, updates);
return entry;
};
// ── MU-LAW VAD ──
const MU_LAW_TABLE = new Int16Array(256);
for (let i = 0; i < 256; i++) {
const sign = (i & 0x80) ? -1 : 1;
const exponent = (~i >> 4) & 0x07;
const mantissa = ~i & 0x0f;
const sample = ((mantissa << 3) + 132) << exponent;
MU_LAW_TABLE[i] = sign * (sample - 132);
}
function decodeMuLaw(buffer) {
const out = new Int16Array(buffer.length);
for (let i = 0; i < buffer.length; i++) out[i] = MU_LAW_TABLE[buffer[i]];
return out;
}
function calculateRMS(pcm) {
let sum = 0;
for (let i = 0; i < pcm.length; i++) sum += pcm[i] * pcm[i];
return Math.sqrt(sum / pcm.length);
}
// ── DASHBOARD ──
app.get("/", (req, res) => {
res.send(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Elite Telecom Control Panel</title>
<script src="https://cdn.tailwindcss.com"></script>
<script src="https://unpkg.com/react@18.2.0/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@18.2.0/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/@babel/standalone@7.23.10/babel.min.js"></script>
</head>
<body class="bg-gray-900 text-gray-100 p-8 font-sans">
<div id="root" class="max-w-4xl mx-auto"></div>
<script type="text/babel">
const { useState, useEffect } = React;
function App() {
const [logs, setLogs] = useState([]);
const [targetNumber, setTargetNumber] = useState("+1");
const [status, setStatus] = useState("");
const fetchLogs = () => fetch("/api/logs").then(r => r.json()).then(setLogs);
useEffect(() => { fetchLogs(); const t = setInterval(fetchLogs, 2000); return () => clearInterval(t); }, []);
const dial = async () => {
setStatus("Dialing...");
const res = await fetch("/dial", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ to: targetNumber }) });
const data = await res.json();
setStatus(data.ok ? "Call initiated!" : "Error: " + data.error);
fetchLogs();
};
const hangup = async (id) => {
await fetch("/call/hangup", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ call_control_id: id }) });
fetchLogs();
};
return (
<div className="space-y-8">
<h1 className="text-3xl font-bold border-b border-gray-700 pb-4">Web Agency Telecom Dashboard</h1>
<div className="bg-gray-800 p-6 rounded-lg flex gap-4 items-end">
<div className="flex-1">
<label className="block text-sm text-gray-400 mb-1">Target Phone Number</label>
<input type="text" value={targetNumber} onChange={e => setTargetNumber(e.target.value)} className="w-full bg-gray-900 border border-gray-700 rounded p-2 text-white outline-none focus:border-blue-500" />
</div>
<button onClick={dial} className="bg-blue-600 hover:bg-blue-500 px-8 py-2 rounded font-bold transition">Trigger Outbound Call</button>
</div>
{status && <div className="text-sm text-yellow-400">{status}</div>}
<div className="bg-gray-800 rounded-lg overflow-hidden">
<table className="w-full text-left">
<thead className="bg-gray-900 text-gray-400 text-sm">
<tr><th className="p-4">Call ID</th><th className="p-4">Number</th><th className="p-4">Last Transcript</th><th className="p-4">Status</th><th className="p-4">Action</th><th className="p-4">Recording</th></tr>
</thead>
<tbody className="divide-y divide-gray-700">
{logs.map(l => (
<tr key={l.id}>
<td className="p-4 text-xs font-mono text-gray-500">{l.call_control_id.slice(0,8)}...</td>
<td className="p-4 font-mono">{l.target_number}</td>
<td className="p-4 text-xs text-gray-300 italic truncate max-w-[200px]" title={l.last_transcript}>{l.last_transcript || "..."}</td>
<td className="p-4">
<span className={\`inline-block px-2 py-1 rounded text-xs \${l.status === 'completed' ? 'bg-green-900 text-green-300' : 'bg-yellow-900 text-yellow-300'}\`}>{l.status}</span>
{l.is_playing && <span className="block text-xs text-purple-400 animate-pulse mt-1">AI speaking...</span>}
</td>
<td className="p-4">
{l.status !== 'completed' ? <button onClick={() => hangup(l.call_control_id)} className="bg-red-600 hover:bg-red-500 text-xs px-3 py-1 rounded font-bold">Force Hang Up</button> : <span className="text-gray-500 text-xs">Ended</span>}
</td>
<td className="p-4">{l.recording_url ? <audio controls src={l.recording_url} className="h-8 w-48"></audio> : <span className="text-gray-500 text-sm">Recording...</span>}</td>
</tr>
))}
{logs.length === 0 && <tr><td colSpan="6" className="p-4 text-center text-gray-500">No calls yet</td></tr>}
</tbody>
</table>
</div>
</div>
);
}
ReactDOM.createRoot(document.getElementById('root')).render(<App />);
</script>
</body>
</html>`);
});
app.get("/api/logs", (req, res) => {
res.json(callLogs.map(({ timers, ...e }) => e).reverse());
});
app.get("/health", (req, res) => res.json({ status: "ok" }));
app.get("/play-recording/:ccid", async (req, res) => {
const entry = callLogs.find(l => l.call_control_id === req.params.ccid);
if (!entry?.raw_telnyx_url) return res.sendStatus(404);
try {
const s3 = await fetch(entry.raw_telnyx_url);
if (!s3.ok) return res.sendStatus(s3.status);
const buf = Buffer.from(await s3.arrayBuffer());
res.setHeader("Content-Type", "audio/mpeg");
res.setHeader("Content-Length", buf.length);
res.send(buf);
} catch { res.sendStatus(500); }
});
app.post("/dial", async (req, res) => {
const { to } = req.body;
log("DIAL", `Dialing ${to}...`);
try {
const response = await fetch("https://api.telnyx.com/v2/calls", {
method: "POST",
headers: { "Content-Type": "application/json", Authorization: `Bearer ${TELNYX_API_KEY}` },
body: JSON.stringify({
connection_id: TELNYX_CONNECTION_ID,
to, from: TELNYX_FROM_NUMBER,
custom_headers: [{ name: "X-Voice-Selection", value: ACTIVE_VOICE }]
})
});
const data = await response.json();
if (!response.ok) return res.status(400).json({ ok: false, error: data?.errors?.[0]?.detail });
callLogs.push({
id: randomUUID(), call_control_id: data.data.call_control_id,
target_number: to, voice_used: ACTIVE_VOICE, status: "dialing",
last_transcript: "", recording_url: null, raw_telnyx_url: null,
is_playing: false, playback_started_at: null,
answered_at: null, timers: {}, created_at: new Date().toISOString()
});
res.json({ ok: true });
} catch (err) { res.status(500).json({ ok: false, error: err.message }); }
});
app.post("/call/hangup", async (req, res) => {
const { call_control_id } = req.body;
if (!call_control_id) return res.status(400).json({ error: "Missing call_control_id" });
await sendTelnyxCmd(call_control_id, "hangup");
res.json({ ok: true });
});
// ── WEBHOOK ──
app.post("/webhook/call", async (req, res) => {
const type = req.body?.data?.event_type;
const payload = req.body?.data?.payload;
const callId = payload?.call_control_id;
if (!type) return res.sendStatus(200);
const entry = callLogs.find(l => l.call_control_id === callId);
if (entry?.status === "completed" && type !== "call.recording.saved") return res.sendStatus(200);
switch (type) {
case "call.initiated":
log("INITIATED", `dir=${payload?.direction}`);
if (payload?.direction === "incoming") {
callLogs.push({
id: randomUUID(), call_control_id: callId, target_number: payload?.from,
voice_used: ACTIVE_VOICE, status: "in-progress", last_transcript: "",
recording_url: null, raw_telnyx_url: null, is_playing: false,
playback_started_at: null, answered_at: null, timers: {}, created_at: new Date().toISOString()
});
await sendTelnyxCmd(callId, "answer");
}
break;
case "call.answered":
log("ANSWERED", `Call ${callId} connected.`);
updateLog(callId, { status: "in-progress", answered_at: new Date().toISOString() });
await sendTelnyxCmd(callId, "record_start", { format: "mp3", channels: "dual", play_beep: false });
await sendTelnyxCmd(callId, "streaming_start", {
stream_url: `wss://${req.headers.host}/audio-stream`,
stream_track: "inbound_track"
});
await sendTelnyxCmd(callId, "transcription_start", {
transcription_engine: "Telnyx",
transcription_tracks: "inbound"
});
if (entry) {
entry.timers.hangup = setTimeout(async () => {
if (entry.status === "completed") return;
log("HANGUP", "Enforcing 90-second limit.");
await sendTelnyxCmd(callId, "hangup");
}, 90000);
}
break;
case "call.playback.ended":
case "call.playback.stopped":
updateLog(callId, { is_playing: false });
break;
case "call.transcription":
const tData = payload?.transcription_data;
if (!tData) break;
const voice = entry?.voice_used || ACTIVE_VOICE;
if (!tData.is_final && entry?.is_playing) {
log("BARGE-IN", "User speaking — stopping AI.");
updateLog(callId, { is_playing: false });
await sendTelnyxCmd(callId, "playback_stop");
}
if (tData.is_final) {
const transcript = tData.transcript.trim();
if (!transcript) break;
log("TRANSCRIPT", `"${transcript}"`);
updateLog(callId, { last_transcript: transcript });
try {
const aiRes = await fetch(`${AI_SERVER_URL}/api/process-text-turn`, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ text: transcript, voice, call_id: callId })
});
if (aiRes.ok) {
const aiData = await aiRes.json();
if (aiData.speak_url && entry?.status !== "completed") {
log("AI_REPLY", `"${aiData.raw_text}"`);
await sendTelnyxCmd(callId, "playback_start", {
audio_url: aiData.speak_url, target_legs: "self"
});
}
}
} catch (e) { log("AI_SERVER_ERROR", e.message); }
}
break;
case "call.recording.saved":
const rawUrl = payload.recording_urls.mp3;
log("RECORDING", rawUrl);
updateLog(callId, { raw_telnyx_url: rawUrl, recording_url: `/play-recording/${callId}` });
break;
case "call.hangup":
updateLog(callId, { status: "completed", is_playing: false });
if (entry?.timers) Object.values(entry.timers).forEach(clearTimeout);
log("CALL ENDED", "Terminated.");
break;
}
res.sendStatus(200);
});
// ── WEBSOCKET: VAD + ECHO SUPPRESSION ──
wss.on("connection", (ws) => {
log("WS", "VAD WebSocket connected");
let isSpeaking = false;
let silenceFrames = 0;
let callControlId = null;
let hasPlayedFiller = false;
let hasGreeted = false;
let totalNoiseFrames = 0;
let wasAiPlaying = false; // Tracks AI playing state across frames for transition detection
const SILENCE_THRESHOLD_FRAMES = 35; // 700ms
const VOLUME_THRESHOLD = 500;
const ECHO_GRACE_PERIOD = 2000; // 2s after AI starts playing, ignore inbound volume
ws.on("message", async (raw) => {
try {
const msg = JSON.parse(raw);
if (msg.event === "start") {
callControlId = msg.start?.call_control_id;
// Greeting fires 1.5s after call connects.
// Uses "Hi, this is Nathan." then registers the turn to the AI server
// so the LLM conversation history knows the intro already happened.
setTimeout(async () => {
if (hasGreeted || !callControlId) return;
const e = callLogs.find(l => l.call_control_id === callControlId);
if (e?.status !== "in-progress") return;
hasGreeted = true;
const greetingPhrase = "Hi, this is Nathan.";
log("SMART_GREETING", `Playing: "${greetingPhrase}"`);
await sendTelnyxCmd(callControlId, "playback_start", {
audio_url: `${AI_SERVER_URL}/play-audio?voice=${e.voice_used}&phrase=${encodeURIComponent(greetingPhrase)}`,
target_legs: "self"
});
// Register greeting into conversation history on the AI server
fetch(`${AI_SERVER_URL}/api/register-greeting`, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ call_id: callControlId, phrase: greetingPhrase })
}).catch(() => {});
}, 1500);
}
if (msg.event === "media") {
const pcm16 = decodeMuLaw(Buffer.from(msg.media.payload, "base64"));
const rms = calculateRMS(pcm16);
const entry = callLogs.find(l => l.call_control_id === callControlId);
const nowAiPlaying = entry?.is_playing || false;
const timeSincePlayback = entry?.playback_started_at
? (Date.now() - entry.playback_started_at) : 9999;
const isEchoWindow = timeSincePlayback < ECHO_GRACE_PERIOD;
// ── When AI starts speaking, hard-reset VAD state ──
// This prevents accumulated silence/noise frames from causing a phantom filler
if (!wasAiPlaying && nowAiPlaying) {
isSpeaking = false;
silenceFrames = 0;
totalNoiseFrames = 0;
hasPlayedFiller = false;
}
wasAiPlaying = nowAiPlaying;
if (rms > VOLUME_THRESHOLD) {
// Suppress echo: if AI just started talking, ignore inbound spikes
if (isEchoWindow) return;
hasGreeted = true;
silenceFrames = 0;
totalNoiseFrames++;
if (!isSpeaking) {
isSpeaking = true;
hasPlayedFiller = false;
if (entry?.is_playing) {
log("BARGE-IN (VAD)", "User speaking — stopping AI.");
entry.is_playing = false;
await sendTelnyxCmd(callControlId, "playback_stop");
}
}
} else if (isSpeaking) {
silenceFrames++;
if (silenceFrames > SILENCE_THRESHOLD_FRAMES && !hasPlayedFiller) {
hasPlayedFiller = true;
isSpeaking = false;
// 8-second blackout: don't fire fillers during IVR intro
const callAge = entry?.answered_at
? Date.now() - new Date(entry.answered_at).getTime() : 0;
if (totalNoiseFrames > 40 && callAge > 8000) {
log("VAD_EARLY_TURN", "Long pause detected — playing filler.");
const fillers = ["Right.", "Got it.", "Okay.", "Yeah.", "Ah, okay."];
const filler = fillers[Math.floor(Math.random() * fillers.length)];
sendTelnyxCmd(callControlId, "playback_start", {
audio_url: `${AI_SERVER_URL}/play-audio?voice=${entry?.voice_used || ACTIVE_VOICE}&phrase=${encodeURIComponent(filler)}`,
target_legs: "self"
}).catch(() => {});
}
totalNoiseFrames = 0;
}
}
}
} catch {}
});
});
server.listen(PORT, "0.0.0.0", () => {
log("STARTUP", `Telecom Server running on port ${PORT}`);
}); |