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

# Outbound Calls and Call Transfers

> The Volubile platform allows you to integrate our AI voice agents into your existing telephone infrastructure to manage your outbound calls. This page presents the different available integration methods.

## Standard Outbound Call

Numbers are assigned by the Volubile team. If you need additional numbers for your agents, please contact Volubile technical support.

## SIP Integration

<Steps>
  <Step title="Configure the SIP Server">
    Provide your SIP server configuration in the [SIP Connection Settings](https://eu.volubile.ai/settings/sip).

    When creating a new SIP connection, you will need to provide the following information:

    * **Connection Name**: Unique identifier for your SIP connection
    * **Destination Number Format**: Select the appropriate format (default: +E.164)
    * **Protocol**: Select TLS and/or SRTP according to your security needs
    * **Routing Method**: Choose between Sequential or Round-Robin
    * **FQDN**: Add one or more fully qualified domain names for your SIP server
    * **Authentication Type**: Select Tech Prefix or Token
    * **Tech Prefix**: If this method is selected, specify a 4-digit prefix that will be added to the destination number
    * **SIP Headers**: Add custom SIP headers in the format "X-\[Name]" and their corresponding values
    * **User-to-User** (Optional): UUI information which will be transported over the Public Switched Telephone Network (PSTN)
  </Step>

  <Step title="Link the Agent">
    Go to the agent configuration page or the agent transfer action and link the previously created SIP connection.

    <Frame>
      <img src="https://mintcdn.com/weengage/qT_zmsw8Ut0OGKeg/images/telephony/volubile-telephony-sip-agent-link.png?fit=max&auto=format&n=qT_zmsw8Ut0OGKeg&q=85&s=9639a5ef28f18a79bf6adb3283cc1d05" width="2630" height="1534" data-path="images/telephony/volubile-telephony-sip-agent-link.png" />
    </Frame>
  </Step>
</Steps>

### Volubile IP Whitelist

To allow our platform to communicate with your SIP infrastructure, you must authorize the following IP addresses on your SIP trunking platform, depending on your region:

<AccordionGroup>
  <Accordion title="Europe">
    * 216.147.0.1
    * 216.147.0.2
    * 216.147.1.1
    * 216.147.1.2
  </Accordion>

  <Accordion title="Americas">
    * 216.147.2.1
    * 216.147.2.2
    * 216.147.3.1
    * 216.147.3.2
  </Accordion>

  <Accordion title="Asia Pacific">
    * 216.147.4.1
    * 216.147.4.2
    * 216.147.5.1
    * 216.147.5.2
  </Accordion>
</AccordionGroup>

<Info>
  The following port ranges apply to the SIP signaling you will exchange with Volubile: **UDP** on port **5060** and **TLS** on port **5061**.
</Info>

### More Information

|                                      |                                      |
| ------------------------------------ | ------------------------------------ |
| RTP/Media Ports                      | **10000 - 50000**                    |
| Intermediate Certificate Authorities | **DigiCert TLS RSA SHA256 2020 CA1** |
| Root Certificate Authorities         | **DigiCert Global Root CA**          |