Retell AI Core Workflow B

Overview

Manage phone calls: outbound campaigns, call transfers, recordings, and concurrent call handling.

Prerequisites

• Completed retellai-core-workflow-a

Instructions

Step 1: Outbound Call Campaign

const phoneNumbers = ['+14155551001', '+14155551002', '+14155551003'];

for (const number of phoneNumbers) {
  try {
    const call = await retell.call.createPhoneCall({
      from_number: process.env.RETELL_PHONE_NUMBER!,
      to_number: number,
      override_agent_id: agentId,
      metadata: { campaign: 'appointment-reminder', date: '2026-04-01' },
    });
    console.log(`Called ${number}: ${call.call_id}`);
  } catch (err) {
    console.error(`Failed to call ${number}: ${err.message}`);
  }
  // Rate limit: space calls apart
  await new Promise(r => setTimeout(r, 2000));
}

Step 2: List and Filter Calls

const calls = await retell.call.list({
  sort_order: 'descending',
  limit: 20,
});
for (const call of calls) {
  console.log(`${call.call_id}: ${call.call_status} — ${call.end_timestamp - call.start_timestamp}ms`);
}

Step 3: Get Call Recording and Transcript

const callDetail = await retell.call.retrieve(callId);
if (callDetail.recording_url) {
  console.log(`Recording: ${callDetail.recording_url}`);
}
if (callDetail.transcript) {
  console.log(`Transcript:\n${callDetail.transcript}`);
}

Output

• Outbound call campaign with rate limiting
• Call listing with status and duration
• Recordings and transcripts retrieved

Error Handling

Error	Cause	Solution
Call fails immediately	Bad phone number format	Use E.164 format
No recording	Recording not enabled	Enable in agent settings
Concurrent limit	Too many active calls	Upgrade plan or queue calls

Resources

• Create Phone Call
• Retell AI Documentation

Next Steps

Handle call events: retellai-webhooks-events