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

# Vonage

> Connect Retell to a Vonage account using SIP trunking — configure termination and origination, set up credentials, and import Vonage numbers for calling.

<Steps>
  <Step title="Create Elastic SIP Trunking">
    1. Locate the SIP section in the Vonage dashboard, and select "Something else" for the provider type.

    <img height="200" src="https://mintcdn.com/retellai/S_iZ2qGP5QpXG6x_/images/custom-telephony/vonage/sip.jpeg?fit=max&auto=format&n=S_iZ2qGP5QpXG6x_&q=85&s=2a11ea60d2f68dae2e2271c2e6d78209" data-path="images/custom-telephony/vonage/sip.jpeg" />

    <img height="200" src="https://mintcdn.com/retellai/32uO5g9DswfoJ9j7/images/custom-telephony/vonage/choose-provider.jpeg?fit=max&auto=format&n=32uO5g9DswfoJ9j7&q=85&s=91a84549630ea9efba5c877f5c945102" data-path="images/custom-telephony/vonage/choose-provider.jpeg" />

    From here, you can follow these instructions step by step.

    2. Set up termination (for outbound)

    * the termination SIP URI and the username and password here are important, we would use them in later steps, please take notes of them.

    <img height="200" src="https://mintcdn.com/retellai/rxvYffEkEJPRL1KD/images/custom-telephony/vonage/termination.jpeg?fit=max&auto=format&n=rxvYffEkEJPRL1KD&q=85&s=ae07c26cab48ca1ddd1b0eb357695600" data-path="images/custom-telephony/vonage/termination.jpeg" />

    3. Set up origination (for inbound)

    * Here you will specify Retell's SIP server address as the origination SIP URI:
      `sip.retellai.com`.

    <img height="200" src="https://mintcdn.com/retellai/rxvYffEkEJPRL1KD/images/custom-telephony/vonage/origination.jpeg?fit=max&auto=format&n=rxvYffEkEJPRL1KD&q=85&s=2358642d1db6f27324c64a9a0ab67f58" data-path="images/custom-telephony/vonage/origination.jpeg" />
  </Step>

  <Step title="Move numbers to Elastic SIP Trunking">
    You've created the elastic SIP trunk, now you would need to purchase numbers / link
    existing numbers to this trunk.

    <img height="200" src="https://mintcdn.com/retellai/32uO5g9DswfoJ9j7/images/custom-telephony/vonage/add-number.jpeg?fit=max&auto=format&n=32uO5g9DswfoJ9j7&q=85&s=00328c683a6c52c135d59b0ecf13c396" data-path="images/custom-telephony/vonage/add-number.jpeg" />
  </Step>

  <Step title="Import numbers to Retell">
    Now the number is set up with your elastic SIP trunking, you need to
    import the number to Retell so that we will know how to route the call.

    Here you will supply the termination SIP URI, the username and password you set up in Step 1.

    <img height="200" src="https://mintcdn.com/retellai/32uO5g9DswfoJ9j7/images/custom-telephony/vonage/import.jpeg?fit=max&auto=format&n=32uO5g9DswfoJ9j7&q=85&s=f1938fc65d930aa91376966506137078" data-path="images/custom-telephony/vonage/import.jpeg" />

    You can also import numbers programmatically via [Import Number API](/api-references/import-phone-number).

    Now the number is imported, you can make and receive calls with this number just like a number
    you purchased from Retell -- it will show up in your dashboard, and you can bind agents, make phone calls from
    Dashboard directly.

    Check out the [Make phone call](/deploy/outbound-call) guide to learn how to make phone calls.
  </Step>
</Steps>