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

# Call transfer tool

> Transfer a live call to a valid phone or SIP destination when the conversation requires a human or another service.

Transfer a live call to a valid phone or SIP destination when the conversation requires a human or another service.

## Prerequisites

* A telephony configuration that supports transfer.
* A destination approved by your organization’s calling policy.

## Configure a transfer

1. Create a **Transfer Call** tool.
2. Choose phone-number mode or SIP-endpoint mode.
3. Enter an E.164 number such as `+1234567890`, or a synthetic SIP value such as `SIP/extension@example.com`.
4. Choose no pre-transfer message, custom text, or pre-recorded audio.
5. Set the timeout and attach the tool to the node that can request the transfer.

## Constraints and failure states

Phone destinations must use E.164 format. SIP destinations must use a supported `SIP/` or `PJSIP/` form. Transfer timeout is clamped between 5 and 120 seconds and defaults to 30 seconds. Provider capability and destination reachability still determine whether the transfer succeeds.

## Protect your data

Do not put private numbers or extension lists in public prompts. Confirm that a transfer destination is authorized before allowing an agent to select it.

## Related

* [Inbound telephony](/integrations/telephony/inbound)
* [End Call tool](/voice-agent/tools/end-call)
* [Pre-recorded audio](/voice-agent/pre-recorded-audio)


## Related topics

- [Pre-recorded audio](/voice-agent/pre-recorded-audio.md)
- [Custom SIP trunk setup](/integrations/telephony/custom-sip-trunk.md)
- [Twilio setup](/integrations/telephony/twilio.md)
- [End Call tool](/voice-agent/tools/end-call.md)
- [Tool lifecycle](/voice-agent/tools/introduction.md)