Fine-tune how your agent sounds, handles calls, deals with voicemails, and what background noise it uses. 🎛️
Pick how your agent sounds:
| Setting | Description |
|---|---|
| Voice | Choose from lots of voices (ElevenLabs, Cartesia, and more) |
| Language | The language the agent speaks (e.g., English US, Spanish, French) 🌍 |
| Responsiveness | How fast the agent replies (0–1 scale; higher = quicker) |
| Interruption Sensitivity | How easy it is for the caller to interrupt (0–1 scale; higher = easier to interrupt) |
| Normalize for Speech | Makes the speech sound more natural |
| Voice Temperature | Controls how much the voice changes between sentences |
| Voice Speed | How fast or slow the agent talks |
Browse and preview voices using these filters:
| Filter | Options |
|---|---|
| Gender | Male, Female |
| Accent | American, British, Australian, etc. |
| Age | Young, Middle-aged, Old |
| Provider | ElevenLabs, Cartesia, Minimax, Fish Audio |
Click the play button ▶️ next to any voice to hear a preview before you pick it.
The Agent Builder keeps a history of test calls so you can review past conversations and compare agent behavior over time. View a list of previous test calls with timestamps and outcomes, open any past call to read the full transcript, and quickly spot patterns or regressions when tuning prompts.
Control how calls work:
| Setting | Description |
|---|---|
| Max Call Duration | The longest a call can be before it ends automatically ⏱️ |
| End Call After Silence | Hang up if nobody talks for a while |
| Ring Duration | How long to ring before giving up (for outbound calls) |
| Denoising Mode | How background noise is handled: cancel noise only, or cancel noise + other voices talking |
Let callers press buttons on their phone to interact:
| Setting | Description |
|---|---|
| Allow User DTMF | Turn on keypad input during calls |
| Input Timeout | How long to wait for a button press |
| DTMF Options | What each button does |
TIP
Keypad input is great for menus like "Press 1 for English, Press 2 for Spanish" or collecting numbers like dates and account IDs. 🔢
Set what happens when the call goes to voicemail:
| Setting | Description |
|---|---|
| Voicemail Detection | Turn voicemail detection on or off |
| Detection Timeout | How long to wait before deciding it's a voicemail |
| Voicemail Action | What to do when voicemail is found |
| Action | Description |
|---|---|
| Hang Up | Just hang up right away |
| Leave Message | The agent leaves a voice message using your text 🗣️ |
| Static Text | Play a fixed message |
When the action is "Leave Message," write the text the agent will say as a voicemail. You can use to fill in names or details, just like in prompts!
Add background noise to make calls feel more real:
| Setting | Description |
|---|---|
| Ambient Sound | The type of background audio |
| Volume | How loud the background sound is |
| Sound | Description |
|---|---|
| Off | No background sound 🔇 |
| Coffee Shop | Chill café vibes ☕ |
| Convention Hall | Big room sounds 🏢 |
| Summer Outdoor | Outside in the summer ☀️ |
| Mountain Outdoor | Nature and mountain sounds 🏔️ |
| Static Noise | Soft static |
| Call Center | Office and call center sounds 🏢 |
Pick the AI brain that powers your agent's replies:
| Setting | Description |
|---|---|
| Model | The AI model used for the conversation (e.g., GPT-4.1, Claude 4.5 Sonnet) |
INFO
The model you pick changes how good, fast, and expensive the replies are. Smarter models give better conversations but might be a little slower and cost more. 💡