# Integrating Elastic SIP Trunking with 3CX

Sinch Elastic SIP Trunking can easily integrate with 3CX. Follow this guide to learn how!

## Before you start

Before you begin setting up your Sinch Elastic SIP trunk make sure you have done the following:

* Sign up for a free account at https://www.sinch.com/ and request access for Elastic SIP Trunking. Need help? Click [here](https://community.sinch.com/t5/Customer-Dashboard/How-to-sign-up-for-your-free-Sinch-account/ta-p/8058) for instructions.
* If you have not already done so, configure and create your Elastic SIP trunk. Instructions on how to do this can be found [here](https://community.sinch.com/t5/Elastic-SIP-Trunking/Getting-started-with-Elastic-SIP-Trunking/ta-p/11380).
* Ensure you note the fully qualified domain name (FQDN) that was created on your SIP Trunk. You will need this while setting up your IP-PBX or SIP Application.


## Configuring your 3CX

1. Log into your 3CX with Admin privileges and navigate to the **Admin Console**. Select **Voice and Chat** from the navigation menu. Once done, select **Add SIP Trunk --> Trunk**.
![gateways](/assets/3cx-admin-console.5bda675531affacb30743142aca8c49dd454cfdbb77ec4e3f968d7a37f1fe4f3.f40ae551.png)
2. On this page, give your trunk a friendly name which can be used to easily identify it as your Sinch Elastic SIP Trunk. Then configure the following:
  - Change the country to “US” and then select “Vitelity” under the Trunk setting. Ignore the option to start configuring the trunk using the Vitelity guide.
  - Set the **Registrar Server** and the **Outbound Proxy** to the FQDN you created when you set up your Elastic SIP Trunk.
**Note:** While you need to fill in the registrar to save the trunk settings, Sinch Elastic SIP Trunking does not support Trunk registration currently.
  - Set a main phone number on your trunk.
Save the trunk configuration.
3CX cannot accept the default wildcard certificate that Sinch uses for TLS at this time.
![add](/assets/3cx-add-trunk.8e03113691b58fb1fb576044eb2fbb723373869e12c9e1877fbbf933a88c01a5.f40ae551.png)
3. Now your Elastic SIP trunk should be operational and ready for traffic. Assign a number to your trunk and give it a try!