Outbound Call Quickstart

import twilio from 'twilio';
import https from 'https';

// ------------------------------------------------------------
// Step 1:  Configure Twilio account and destination number
// ------------------------------------------------------------
const TWILIO_ACCOUNT_SID = 'your_twilio_account_sid_here';
const TWILIO_AUTH_TOKEN = 'your_twilio_auth_token_here';
const TWILIO_PHONE_NUMBER = 'your_twilio_phone_number_here';
const DESTINATION_PHONE_NUMBER = 'the_destination_phone_number_here';

// ------------------------------------------------------------
// Step 2:  Configure Ultravox API key
//
// Optional: Modify the system prompt
// ------------------------------------------------------------
const ULTRAVOX_API_KEY = 'your_ultravox_api_key_here';
const SYSTEM_PROMPT = 'Your name is Steve and you are calling a person on the phone. Ask them their name and see how they are doing.';

const ULTRAVOX_CALL_CONFIG = {
    systemPrompt: SYSTEM_PROMPT,
    model: 'fixie-ai/ultravox',
    voice: 'Mark',
    temperature: 0.3,
    firstSpeakerSettings: { user: {} },     // For outgoing calls, the user will answer the call (i.e. speak first)
    medium: { twilio: {} }                  // Use twilio medium
};

// Validates all required config vars are set
function validateConfiguration() {
    const requiredConfig = [
        { name: 'TWILIO_ACCOUNT_SID', value: TWILIO_ACCOUNT_SID, pattern: /^AC[a-zA-Z0-9]{32}$/ },
        { name: 'TWILIO_AUTH_TOKEN', value: TWILIO_AUTH_TOKEN, pattern: /^[a-zA-Z0-9]{32}$/ },
        { name: 'TWILIO_PHONE_NUMBER', value: TWILIO_PHONE_NUMBER, pattern: /^\+[1-9]\d{1,14}$/ },
        { name: 'DESTINATION_PHONE_NUMBER', value: DESTINATION_PHONE_NUMBER, pattern: /^\+[1-9]\d{1,14}$/ },
        { name: 'ULTRAVOX_API_KEY', value: ULTRAVOX_API_KEY, pattern: /^[a-zA-Z0-9]{8}\.[a-zA-Z0-9]{32}$/ }
    ];

    const errors = [];

    for (const config of requiredConfig) {
        if (!config.value || config.value.includes('your_') || config.value.includes('_here')) {
            errors.push(`❌ ${config.name} is not set or still contains placeholder text`);
        } else if (config.pattern && !config.pattern.test(config.value)) {
            errors.push(`❌ ${config.name} format appears invalid`);
        }
    }

    if (errors.length > 0) {
        console.error('🚨 Configuration Error(s):');
        errors.forEach(error => console.error(`   ${error}`));
        console.error('\n💡 Please update the configuration variables at the top of this file:');
        console.error('   • TWILIO_ACCOUNT_SID should start with "AC" and be 34 characters');
        console.error('   • TWILIO_AUTH_TOKEN should be 32 characters');
        console.error('   • Phone numbers should be in E.164 format (e.g., +1234567890)');
        console.error('   • ULTRAVOX_API_KEY should be 8 chars + period + 32 chars (e.g., Zk9Ht7Lm.wX7pN9fM3kLj6tRq2bGhA8yE5cZvD4sT)');
        console.error('\n📦 If you get module import errors, install dependencies with:');
        console.error('   npm install twilio');
        process.exit(1);
    }

    console.log('✅ Configuration validation passed!');
}

// Creates the Ultravox call using the above config
async function createUltravoxCall() {
    const ULTRAVOX_API_URL = 'https://api.ultravox.ai/api/calls';
    const request = https.request(ULTRAVOX_API_URL, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'X-API-Key': ULTRAVOX_API_KEY
        }
    });

    return new Promise((resolve, reject) => {
        let data = '';
        request.on('response', (response) => {
            response.on('data', chunk => data += chunk);
            response.on('end', () => {
                try {
                    const parsedData = JSON.parse(data);
                    if (response.statusCode >= 200 && response.statusCode < 300) {
                        resolve(parsedData);
                    } else {
                        reject(new Error(`Ultravox API error (${response.statusCode}): ${data}`));
                    }
                } catch (parseError) {
                    reject(new Error(`Failed to parse Ultravox response: ${data}`));
                }
            });
        });
        request.on('error', (error) => {
            reject(new Error(`Network error calling Ultravox: ${error.message}`));
        });
        request.write(JSON.stringify(ULTRAVOX_CALL_CONFIG));
        request.end();
    });
}

// Starts the program and makes the call
async function main() {
    console.log('🚀 Starting Outbound Ultravox Voice AI Phone Call...\n');
    validateConfiguration();
    
    try {
        console.log('📞 Creating Ultravox call...');
        const ultravoxResponse = await createUltravoxCall();
        
        if (!ultravoxResponse.joinUrl) {
            throw new Error('No joinUrl received from Ultravox API');
        }
        
        console.log('✅ Got Ultravox joinUrl:', ultravoxResponse.joinUrl);

        console.log('📱 Initiating Twilio call...');
        const client = twilio(TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN);
        
        const call = await client.calls.create({
            twiml: `<Response><Connect><Stream url="${ultravoxResponse.joinUrl}"/></Connect></Response>`,
            to: DESTINATION_PHONE_NUMBER,
            from: TWILIO_PHONE_NUMBER
        });

        console.log('🎉 Twilio outbound phone call initiated successfully!');
        console.log(`📋 Twilio Call SID: ${call.sid}`);
        console.log(`📞 Calling ${DESTINATION_PHONE_NUMBER} from ${TWILIO_PHONE_NUMBER}`);
        
    } catch (error) {
        console.error('💥 Error occurred:');
        
        if (error.message.includes('Authentication')) {
            console.error('   🔐 Authentication failed - check your Twilio credentials');
        } else if (error.message.includes('phone number')) {
            console.error('   📞 Phone number issue - verify your phone numbers are correct');
        } else if (error.message.includes('Ultravox')) {
            console.error('   🤖 Ultravox API issue - check your API key and try again');
        } else {
            console.error(`   ${error.message}`);
        }
        
        console.error('\n🔍 Troubleshooting tips:');
        console.error('   • Double-check all configuration values');
        console.error('   • Ensure phone numbers are in E.164 format (+1234567890)');
        console.error('   • Verify your Twilio account has sufficient balance');
        console.error('   • Check that your Ultravox API key is valid');
        console.error('   • If you get import errors, run: npm install twilio');
    }
}

main();