> ## Documentation Index
> Fetch the complete documentation index at: https://docs.closerx.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom SMS Function Call

> Trigger personalized SMS during or after AI calls — confirm bookings, send links, or follow up.

## Custom SMS Function Call

Let your AI **send SMS instantly** — no human needed.\
Used for **appointment confirmations**, **payment links**, **follow-ups**, or **voicemail drops**.

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### How It Works

| Trigger            | AI Action      | SMS Sent                                      |
| ------------------ | -------------- | --------------------------------------------- |
| "Text me the link" | Detects intent | "Hi John, here's your appt: \[link]"          |
| Call ends (booked) | Auto-confirm   | "Your appt is Tue 3pm. Reply STOP to opt-out" |
| Missed call        | Voicemail drop | "We tried calling. Call back at +1555..."     |

***

### Setup Steps

1. **Agent Editor** → **Tools** → **+ Add Function** → **Send SMS**
2. Configure:
   * **Provider**: Twilio, GHL, or Native
   * **From Number**: Client’s verified number
   * **Template**:
     ```text theme={null}
     Hi {first_name}, your appt with {agent_name} is confirmed for {date} at {time}.
     View: {booking_url}
     ```