New Send message tool for Voice AI agents

Telnyx Voice AI agents can now send SMS directly through a new send_message tool. This gives agents the same messaging workflow as Messaging AI Assistants and removes the need for external SMS logic.

What’s new

• Send_message tool: Enables SMS sending from within Voice AI agents.
• Unified requirements: Uses the same prerequisites as Messaging AI Assistants.
• Verified number support: Works with 10DLC or toll-free numbers assigned to the agent.
• Automatic routing: Sends only to the caller’s number, from the agent’s assigned number.
• Portal workflow: Prompts users to add a number if the assistant has none.

Why it matters

• Reduces external integration work for SMS actions.
• Simplifies agent design by using consistent messaging rules.
• Prevents misrouting by enforcing known sender and recipient numbers.
• Improves reliability by ensuring all messages originate from verified numbers.

Example use cases

• Send appointment confirmations after a voice interaction.
• Deliver support ticket IDs while the caller remains on the line.
• Provide follow-up links or instructions after task completion.

Getting started

1. Open Mission Control Portal and go to AI Assistance.
2. Assign a verified 10DLC or toll-free number to the assistant.
3. Enable messaging for that number.
4. Use the send_message tool from your agent workflow.
5. Test by placing a call and triggering an SMS action.

Try the tool in our Mission Control Portal or contact your Telnyx team.