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

# 9. Call Settings

Here you configure how the agent handles phone calls, user interactions, audio quality, and follow-up behaviour.

* **Format To Number As Indian (ON/OFF):** automatically converts numbers into the standard Indian format — for example, adding 91 at the start, after first checking the number is 10 digits.
* **Auto Rescheduling (ON/OFF):** automatically reschedules calls when the user is busy or asks for a callback later.
* **Followup (ON/OFF):** lets the agent use past conversation history to personalise and improve future calls.
* **Background Noise (ON/OFF):** turns on or off subtle call-center background noise to make the call feel more natural.
* **Background Noise Volume (0-1):** controls how loud that background noise is.
* **Noise Cancellation (ON/OFF):** reduces noise from the recipient's side to improve voice clarity.
* **Noise Cancellation Strength (0.05-1.00):** controls how strongly background noise is removed. Higher values apply stronger noise reduction.
* **Noise Cancellation Strategy:** selects the noise-reduction engine. Available options are Callkaro, DTLN, DeepFilterNet, and NoiseReduce.
* **Leave Voicemail Message (ON/OFF):** turns automatic voicemail messages on or off when a call reaches voicemail.
* **Voicemail Type:** how the agent creates and delivers a voicemail. Dynamic means the LLM creates and delivers it based on the call context; Custom means you write a fixed voicemail in the “Custom Voicemail Message” section.
* **Time Limit (sec):** the maximum time the agent can stay active on a call before it is ended automatically.
* **Disconnect Timeout (sec):** how long the system waits before disconnecting an inactive or unresponsive call.

## Noise cancellation

CallKaro supports built-in noise cancellation to reduce background noise from the recipient's audio and improve transcription and response quality.

To configure it in the agent builder:

1. Turn on **Noise Cancellation**.
2. Set **Noise Cancellation Strength** based on the amount of background noise. Start with `1.00` for maximum reduction.
3. Select **Callkaro** under **Noise Cancellation Strategy**.

<Tip>
  **Recommended strategy:** Use **Callkaro** for noise cancellation. It is the recommended option for agents created and configured through the CallKaro frontend.
</Tip>