Twilio Phone Skill

Make phone calls with natural AI-generated voices (ElevenLabs) and send SMS using the official Twilio CLI.

Quick Start - AI Voice Call

To make a call with a natural ElevenLabs voice, run the script:

./.claude/skills/twilio-phone/scripts/voice_call.py \
  --to "+61XXXXXXXXXX" \
  --message "Your message here"

Available Phone Numbers

Number	Region	Use For
+61 3 4827 9516	Australia	Australian calls/SMS
+1 978 878 5597	USA	US calls/SMS

ElevenLabs Voices

Voice ID	Name	Accent
IKne3meq5aSn9XLyUdCD	Charlie	Australian
JBFqnCBsd6RMkjVDRZzb	George	British
Xb7hH8MSUJpSbSDYk0k2	Alice	British
EXAVITQu4vr4xnSDxMaL	Sarah	American
CwhRBWXzGAHq8TQ4Fs17	Roger	American

Default: Charlie (Australian) with eleven_v3 model

Manual Process (Step by Step)

1. Generate audio with ElevenLabs

curl -X POST "https://api.elevenlabs.io/v1/text-to-speech/IKne3meq5aSn9XLyUdCD?output_format=mp3_44100_128" \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Your message here",
    "model_id": "eleven_v3",
    "voice_settings": {
      "stability": 0.5,
      "similarity_boost": 0.75
    }
  }' \
  --output /tmp/call_audio.mp3

2. Upload audio to public URL

curl -s -X POST -F "file=@/tmp/call_audio.mp3" "https://tmpfiles.org/api/v1/upload"
# Returns: {"data":{"url":"http://tmpfiles.org/XXXXXX/call_audio.mp3"}}
# Convert to direct URL: https://tmpfiles.org/dl/XXXXXX/call_audio.mp3

3. Make call with Twilio

twilio api:core:calls:create \
  --from "+61348279516" \
  --to "+61XXXXXXXXXX" \
  --twiml "<Response><Play>https://tmpfiles.org/dl/XXXXXX/call_audio.mp3</Play></Response>"

Basic Twilio TTS Call (No ElevenLabs)

twilio api:core:calls:create \
  --from "+61348279516" \
  --to "+61XXXXXXXXXX" \
  --twiml "<Response><Say voice=\"alice\" language=\"en-AU\">Your message here.</Say></Response>"

Sending SMS

twilio api:core:messages:create \
  --from "+61348279516" \
  --to "+61XXXXXXXXXX" \
  --body "Your message here"

TwiML Elements

Play - Play audio file

<Response><Play>https://example.com/audio.mp3</Play></Response>

Say - Text to speech (Twilio built-in)

<Response><Say voice="alice" language="en-AU">Text to speak</Say></Response>

Pause - Add silence

<Pause length="2"/>

Gather - Collect DTMF input

<Gather numDigits="1" action="https://example.com/handle-key">
  <Say>Press 1 for sales, 2 for support.</Say>
</Gather>

Call Options

Option	Description
--timeout 30	Ring for 30 seconds before giving up
--record	Record the call
--machine-detection Enable	Detect answering machines
--send-digits "W1234#"	Dial extension after connecting

Check Status

# List recent calls
twilio api:core:calls:list --limit 10

# Get specific call details
twilio api:core:calls:fetch --sid CAXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

# List recent SMS
twilio api:core:messages:list --limit 10

Environment Variables

Required in .env:

ELEVENLABS_API_KEY=sk_xxxxx

Twilio CLI must be authenticated first. Run twilio login to configure.

Important Notes

1. Phone format: Use E.164 format (+61 for Australia, +1 for US)
2. Australian mobiles: +614XXXXXXXX (drop leading 0)
3. Audio hosting: tmpfiles.org URLs expire after some time
4. ElevenLabs model: eleven_v3 is the most natural sounding
5. Default voice: Charlie (Australian accent)