feat: basic calling express server

.env.sample

@@ -1,3 +1,4 @@
 OPENAI_API_KEY="openaikey"
 TWILIO_ACCOUNT_SID=account_sid
-TWILIO_AUTH_TOKEN=auth_token
+TWILIO_AUTH_TOKEN=auth_token
+TWILIO_PHONE_NUMBER=phone_number

call.js

@@ -1,3 +1,30 @@
-// call.js
 import * as dotenv from "dotenv";
 dotenv.config();
+
+import twilio from "twilio";
+import express from "express";
+
+const accountSid = process.env.TWILIO_ACCOUNT_SID;
+const authToken = process.env.TWILIO_AUTH_TOKEN;
+const phone_number = process.env.TWILIO_PHONE_NUMBER;
+
+const client = new twilio.Twilio(accountSid, authToken);
+const app = express();
+
+app.post("/voice", (request, response) => {
+  console.log("got call!");
+  const voiceResponse = new twilio.twiml.VoiceResponse();
+  voiceResponse.say({ voice: "alice" }, "hello world!");
+
+  // Render the response as XML in reply to the webhook request
+  response.type("text/xml");
+  response.send(twiml.toString());
+});
+
+// Create an HTTP server and listen for requests on port 3000
+app.listen(3000, () => {
+  console.log(
+    "Now listening on port 3000. " +
+      "Be sure to restart when you make code changes!"
+  );
+});