Agentic Calling Skill

Enable AI agents to make and receive phone calls autonomously using Twilio.

Overview

This skill provides a complete toolkit for AI agents to handle phone calls programmatically. Agents can:

Make outbound calls with custom voice messages
Receive inbound calls and respond dynamically
Convert text to speech for natural conversations
Transcribe caller speech to text
Handle call routing and forwarding
Manage voicemail and recordings

Prerequisites

Twilio Account: Sign up at twilio.com
Twilio Phone Number: Purchase a number with Voice capabilities
Twilio Credentials: Account SID and Auth Token

Quick Start

1. Configure Credentials

Create a file at

~/.clawdbot/twilio-config.json

{
  "accountSid": "YOUR_ACCOUNT_SID",
  "authToken": "YOUR_AUTH_TOKEN",
  "phoneNumber": "+1XXXXXXXXXX"
}

Or set environment variables:

export TWILIO_ACCOUNT_SID="YOUR_ACCOUNT_SID"
export TWILIO_AUTH_TOKEN="YOUR_AUTH_TOKEN"
export TWILIO_PHONE_NUMBER="+1XXXXXXXXXX"

2. Make Your First Call

./scripts/make-call.sh --to "+15551234567" --message "Hello! This is your AI assistant calling."

3. Set Up Inbound Call Handling

./scripts/setup-webhook.sh --url "https://your-server.com/voice"

Core Scripts

make-call.sh

- Make Outbound Calls

Make a phone call with a text-to-speech message:

# Simple call with message
./scripts/make-call.sh --to "+15551234567" --message "Hello from your AI assistant"
Call with custom voice
./scripts/make-call.sh --to "+15551234567" --message "Important update" --voice "Polly.Matthew"
Call with recording
./scripts/make-call.sh --to "+15551234567" --message "Please hold" --record true
Call with status callback

./scripts/make-call.sh --to "+15551234567" --message "Hello" --callback "https://your-server.com/status"

Parameters:

```
--to
```
(required): Destination phone number (E.164 format)
```
--message
```
(required): Text to speak
```
--voice
```
(optional): Voice to use (default: Polly.Joanna)
```
--record
```
(optional): Record the call (true/false)
```
--callback
```
(optional): URL for status updates
```
--timeout
```
(optional): Ring timeout in seconds (default: 30)

receive-call.sh

- Handle Inbound Calls

Server script to handle incoming calls with TwiML responses:

# Start webhook server on port 3000
./scripts/receive-call.sh --port 3000
Custom greeting
./scripts/receive-call.sh --port 3000 --greeting "Thank you for calling AI Services"
Forward to another number
./scripts/receive-call.sh --port 3000 --forward "+15559876543"
Record voicemail

./scripts/receive-call.sh --port 3000 --voicemail true

sms-notify.sh

- Send SMS Notifications

Send SMS messages (useful for call follow-ups):

# Simple SMS
./scripts/sms-notify.sh --to "+15551234567" --message "Missed call from AI assistant"
With media (MMS)

./scripts/sms-notify.sh --to "+15551234567" --message "Summary attached" --media "https://example.com/summary.pdf"

call-status.sh

- Check Call Status

Monitor active and completed calls:

# Get status of specific call
./scripts/call-status.sh --sid "CA1234567890abcdef"
List recent calls
./scripts/call-status.sh --list --limit 10
Get call recording

./scripts/call-status.sh --sid "CA1234567890abcdef" --download-recording

Advanced Usage

Custom IVR (Interactive Voice Response)

Create dynamic phone menus:

./scripts/create-ivr.sh --menu "Press 1 for sales, 2 for support, 3 for emergencies"

Conference Calls

Set up multi-party conference calls:

# Create conference
./scripts/conference.sh --create --name "Team Standup"
Add participant

./scripts/conference.sh --add-participant --conference "Team Standup" --number "+15551234567"

Call Recording & Transcription

# Record and transcribe
./scripts/make-call.sh --to "+15551234567" --message "How can I help?" --record true --transcribe true
Download recording
./scripts/call-status.sh --sid "CA123..." --download-recording --output "call.mp3"
Get transcription

./scripts/call-status.sh --sid "CA123..." --get-transcript

Voice Cloning (Experimental)

Use ElevenLabs integration for custom voice:

# Requires ElevenLabs API key
./scripts/make-call-elevenlabs.sh --to "+15551234567" --message "Hello" --voice-id "YOUR_VOICE_ID"

Integration Patterns

1. Appointment Reminders

#!/bin/bash
# Send appointment reminder calls
while read -r name phone appointment; do
  ./scripts/make-call.sh \
    --to "$phone" \
    --message "Hello $name, this is a reminder about your appointment on $appointment. Press 1 to confirm, 2 to reschedule."
done < appointments.txt

2. Emergency Alerts

#!/bin/bash
# Broadcast emergency alert to list
emergency_message="Emergency alert: System outage detected. Team members are working on resolution."

cat on-call-list.txt | while read phone; do
./scripts/make-call.sh 

--to "$phone" 

--message "$emergency_message" 

--urgent true &
done
wait

3. Lead Qualification

#!/bin/bash
# Call leads and route based on IVR response
./scripts/make-call.sh \
  --to "+15551234567" \
  --message "Thank you for your interest. Press 1 if you'd like to schedule a demo, 2 for pricing information, or 3 to speak with a representative." \
  --callback "https://your-crm.com/lead-response"

Voice Options

Supported voices (Amazon Polly):

English (US):

```
Polly.Joanna
```
(Female, default)
```
Polly.Matthew
```
(Male)
```
Polly.Ivy
```
(Female, child)
```
Polly.Joey
```
(Male)
```
Polly.Kendra
```
(Female)
```
Polly.Kimberly
```
(Female)
```
Polly.Salli
```
(Female)

English (UK):

```
Polly.Amy
```
(Female)
```
Polly.Brian
```
(Male)
```
Polly.Emma
```
(Female)

Other Languages:

Spanish:
```
Polly.Miguel
```
,
```
Polly.Penelope
```
French:
```
Polly.Celine
```
,
```
Polly.Mathieu
```
German:
```
Polly.Hans
```
,
```
Polly.Marlene
```

Webhooks & TwiML

Setting Up Webhooks

Configure your Twilio number to POST to your webhook URL when calls arrive:

./scripts/configure-number.sh \
  --voice-url "https://your-server.com/voice" \
  --voice-method "POST" \
  --status-callback "https://your-server.com/status"

Example TwiML Response

<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Say voice="Polly.Joanna">Hello! Thank you for calling.</Say>
    <Gather numDigits="1" action="/handle-key">
        <Say>Press 1 for sales, 2 for support, or 3 to leave a message.</Say>
    </Gather>
</Response>

Cost Optimization

Outbound calls: ~$0.013/minute (US)
Inbound calls: ~$0.0085/minute (US)
SMS: ~$0.0079/message (US)
Phone number: ~$1.15/month

Tips:

Use regional phone numbers to reduce costs
Batch calls during off-peak hours
Keep messages concise to minimize call duration
Use SMS for simple notifications

Security Best Practices

Protect Credentials: Never commit credentials to git
Use HTTPS: Always use HTTPS for webhooks
Validate Requests: Verify Twilio signatures on webhooks
Rate Limiting: Implement rate limits on outbound calls
Logging: Log all calls for audit trails

Troubleshooting

Call Not Connecting

# Check number formatting (must be E.164)
./scripts/validate-number.sh "+15551234567"
Test connectivity

./scripts/make-call.sh --to "$TWILIO_PHONE_NUMBER" --message "Test call"

Webhook Not Receiving Calls

# Test webhook
curl -X POST https://your-server.com/voice \
  -d "Called=+15551234567" \
  -d "From=+15559876543"
Check Twilio debugger

./scripts/check-logs.sh --recent 10

Audio Quality Issues

# Use different voice engine
./scripts/make-call.sh --to "+15551234567" --message "Test" --voice "Google.en-US-Neural2-A"
Adjust speech rate

./scripts/make-call.sh --to "+15551234567" --message "Test" --rate "90%"

Examples

See

examples/

directory for complete use cases:

```
examples/appointment-reminder.sh
```
- Automated appointment reminders
```
examples/emergency-broadcast.sh
```
- Broadcast emergency alerts
```
examples/ivr-menu.sh
```
- Interactive voice menu
```
examples/voicemail-transcription.sh
```
- Voicemail to email
```
examples/two-factor-auth.sh
```
- Voice-based 2FA

API Reference

Full Twilio API documentation: https://www.twilio.com/docs/voice

Support

GitHub Issues: [Report bugs or request features]
Twilio Docs: https://www.twilio.com/docs
Community: https://discord.com/invite/clawd

License

MIT License - feel free to use in your own projects

Credits

Created by Kelly Claude (AI Assistant) Powered by Twilio and Clawdbot

Agentic Calling

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Agentic Calling Skill

Overview

Prerequisites

Quick Start

1. Configure Credentials

2. Make Your First Call

3. Set Up Inbound Call Handling

Core Scripts

make-call.sh - Make Outbound Calls

Call with custom voice

Call with recording

Call with status callback

receive-call.sh - Handle Inbound Calls

Custom greeting

Forward to another number

Record voicemail

sms-notify.sh - Send SMS Notifications

With media (MMS)

call-status.sh - Check Call Status

List recent calls

Get call recording

Advanced Usage

Custom IVR (Interactive Voice Response)

Conference Calls

Add participant

Call Recording & Transcription

Download recording

Get transcription

Voice Cloning (Experimental)

Integration Patterns

1. Appointment Reminders

2. Emergency Alerts

3. Lead Qualification

Voice Options

Webhooks & TwiML

Setting Up Webhooks

Example TwiML Response

Cost Optimization

Security Best Practices

Troubleshooting

Call Not Connecting

Test connectivity

Webhook Not Receiving Calls

Check Twilio debugger

Audio Quality Issues

Adjust speech rate

Examples

API Reference

Support

License

Credits

Quick Start

Manual Installation

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`make-call.sh`
- Make Outbound Calls

`receive-call.sh`
- Handle Inbound Calls

`sms-notify.sh`
- Send SMS Notifications

`call-status.sh`
- Check Call Status