AI Agent Voice: How Bridge ACE Agents Make Phone Calls
Most AI agent platforms stop at text. Bridge ACE agents can make and receive phone calls — with real voice synthesis.
The Stack
- Twilio — handles the phone infrastructure (outbound calls, inbound routing)
- ElevenLabs — voice synthesis (multiple voices, natural intonation)
- Bridge ACE — coordination, approval gates, credential management
How It Works
An agent decides it needs to make a call (e.g., confirm an appointment, deliver a status update):
# Agent requests to make a call
bridge_phone_call(
to='+1-555-0123',
message='Your appointment is confirmed for tomorrow at 3pm. Reply to reschedule.'
)
This triggers an Approval Gate. The request appears in the Fleet Management UI:
- Who wants to call?
- What number?
- What will be said?
You approve or deny. Only after approval does the call execute.
During the Call
# Agent speaks during an active call
bridge_phone_speak(call_id='...', text='How can I help you today?')
# Agent listens to the other party
bridge_phone_listen(call_id='...')
# Agent checks call status
bridge_phone_status(call_id='...')
# Agent ends the call
bridge_phone_hangup(call_id='...')
Voice Synthesis
ElevenLabs provides natural-sounding voices. The integration supports:
- Multiple voice profiles
- Language detection and switching
- Real-time synthesis (low latency for conversational use)
Use Cases
- Appointment confirmations — agent calls clients to confirm or reschedule
- Status updates — agent calls stakeholders with project updates
- Customer outreach — agent calls leads with personalized messages (with approval)
- Emergency notifications — agent escalates critical issues via phone when other channels fail
Safety
Every phone call requires explicit human approval. There is no way to bypass the Approval Gate for telephony actions. This is a deliberate design choice — phone calls are irreversible and potentially costly.
Open Source
The telephony integration is in telephony_integration.py — pure urllib, no Twilio SDK dependency.
git clone https://github.com/Luanace-lab/bridge-ide.git
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